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New Study Finds Marine Scrubbers Can Be More Environmentally Friendly Than Low-Sulfur Fuels

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Hedwig Oldendorff vessel at the Port of Taicang, China, prior to the start of the emission monitoring voyage. Credits: Photo: Courtesy of Patricia Stathatou

A new study led by researchers from MIT, Georgia Tech, and other institutions suggests that the use of marine scrubbers—devices that clean sulfur emissions from exhaust gases—may be just as environmentally friendly, if not more so, than burning low-sulfur fuels. This groundbreaking research, published in Environmental Science and Technology, challenges the common assumptions about the environmental impact of scrubbers and has important implications for the future of the maritime industry.

The 2020 mandate by the International Maritime Organization (IMO) to cap the sulfur content of marine fuels at 0.5% pushed shipping companies to consider alternatives to the traditionally used heavy fuel oil (HFO), which contains much higher levels of sulfur. The options? Companies could either burn low-sulfur fossil fuels, install exhaust gas cleaning systems (scrubbers), or switch to biofuels. While the latter has been limited by availability, scrubbers became the go-to solution for many, thanks to their cost-effectiveness and ability to enable continued use of cheaper, high-sulfur fuels.

However, a critical question remained: How “green” are scrubbers when viewed through a holistic environmental lens?

“Scrubbers Turned Out to Be an Unexpectedly Deep and Important Transitional Issue”

According to Neil Gershenfeld, MIT professor and senior author of the study, the study explored this question through a comprehensive lifecycle assessment. “In our collaboration with Oldendorff Carriers to broadly explore reducing the environmental impact of shipping, this study of scrubbers turned out to be an unexpectedly deep and important transitional issue,” he explained.

The Study: A Comprehensive “Well-to-Wake” Assessment

The researchers used a “well-to-wake” approach, which examines the environmental impact of fuels and technologies from production to final use. They looked at everything from the manufacturing and transportation of fuels to their emissions when burned on ships. They also gathered data directly from a bulk carrier vessel in China that burns heavy fuel oil with a scrubber and low-sulfur fuel under similar conditions. The team analyzed emissions from the exhaust and samples of washwater discharged from the scrubbers, which is often a concern due to its potential toxicity.

Lead author Patricia Stathatou, an assistant professor at Georgia Tech, emphasized that a full lifecycle analysis is critical for understanding the true environmental impact. “If we just look at everything that happens before the fuel is bunkered onboard the vessel, heavy fuel oil is significantly more low-impact, environmentally, than low-sulfur fuels,” Stathatou said. She added that scrubbers, with a lifetime of about 20 years, have a minimal environmental footprint compared to the energy-intensive production of low-sulfur fuels.

Surprising Findings: Scrubbers Surpass Low-Sulfur Fuels in Several Areas

The results of the study were surprising. When the researchers considered the entire lifecycle, including the production of fuels and scrubbers, burning heavy fuel oil with scrubbers was found to be the least harmful option in terms of most environmental factors, such as greenhouse gas emissions, terrestrial acidification, and ozone formation.

“The claims about environmental hazards and policies to mitigate them should be backed by science,” said Stathatou. “You need to see the data, be objective, and design studies that take into account the full picture to be able to compare different options from an apples-to-apples perspective.”

Scrubbers: A Proven and Mature Technology

Marine scrubbers, which have been used for decades in land-based applications like power plants, are now widely deployed in the shipping industry. Scrubbers are typically large vertical tanks that use seawater to wash sulfur dioxide from the exhaust gases. The seawater reacts with the sulfur, converting it into sulfates, which are environmentally benign. The washwater is then released back into the ocean, where it is diluted by the vast expanse of seawater.

Despite concerns over the acidity and potential pollutants in the washwater, the study found that most chemical concentrations in the washwater were well below the limits set by environmental regulations, such as those from the U.S. Environmental Protection Agency and the European Union.

Scrubbers Meet International Standards

The researchers also tested the washwater for over 60 chemical parameters, including metals and hydrocarbons, and found that concentrations of harmful substances were generally well within safe levels. “Scrubbers reduce sulfur dioxide emissions by 97 percent, making them just as effective as low-sulfur fuels in terms of sulfur emissions,” said Scott Bergeron, managing director of Oldendorff Carriers, who co-authored the study.

A Call for Balanced Environmental Policies

This research has significant implications for future maritime environmental policies. As Stathatou points out, there is growing momentum toward alternative fuels, but it’s critical to assess the environmental impacts of these fuels in comparison to current technologies. “We must do our due diligence to compare them equally with existing solutions to see the costs and benefits,” she said.

The study’s findings could reshape policies governing the maritime industry, suggesting that scrubbers may offer a more sustainable path forward than previously thought. The research team hopes this will prompt a more science-driven approach to reducing shipping’s environmental footprint.

The study, which includes contributions from researchers at MIT, Georgia Tech, and Oldendorff Carriers, highlights the importance of scientific analysis in shaping policies that reduce the environmental impact of global shipping. With over 5,800 vessels now using scrubbers worldwide, the technology is clearly making an impact, but questions around its long-term environmental effects are only just beginning to be answered.

COP30

Earth Nears Dangerous Tipping Points Amid Rapid Warming, Urgent Action Needed at COP30

The Global Tipping Points Report 2025 warns of imminent climate tipping risks at 1.5°C warming, urging urgent global action at COP30 to prevent irreversible impacts and accelerate sustainable transitions.

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The Global Tipping Points Report 2025 warns of imminent climate tipping risks at 1.5°C warming, urging urgent global action at COP30 to prevent irreversible impacts and accelerate sustainable transitions.
Icebergs Drift Through Iceland's Glacier Lagoon/Photo credit: Yanic Dammann/Pexels

As global warming edges perilously close to the 1.5°C threshold, a new scientific report warns that Earth’s vital ecosystems are approaching irreversible tipping points with catastrophic implications for billions of people worldwide. Released ahead of the COP30 climate summit in Belém, Brazil, the ‘Global Tipping Points Report 2025‘ issued by leading researchers from the University of Exeter and international partners reveals an urgent call for unprecedented global cooperation to prevent cascading system collapses.

“Already at 1.4°C of global warming, coral reefs face unprecedented dieback, while polar ice sheets threaten multi-metre sea level rise,” states the report. “The Amazon rainforest risks widespread dieback below 2°C, jeopardizing biodiversity and the livelihoods of over 100 million people.” The report highlights the intertwining threats posed by climate change, deforestation, and feedback loops that amplify warming risks, including potential collapse of the Atlantic Ocean circulation that governs weather patterns across Europe and Africa.

Urgency is paramount. The report emphasizes that exceeding 1.5°C—even briefly—significantly increases the odds of triggering multiple tipping points with cascading effects that disrupt food security, water availability, and economic stability globally. Authors warn that waiting until tipping points are crossed before acting is a grave mistake; instead, immediate measures to halve global greenhouse gas emissions by 2030 and achieve net zero by 2050 are essential.

The report also highlights emerging positive tipping points fueled by rapid adoption of solar power, electric vehicles, and nature-positive initiatives as crucial leverage points for accelerating sustainable transformation. “Positive tipping points can cascade across sectors, driving exponential change,” the researchers note, urging coherent policy mandates, finance mobilization, and inclusive governance to unleash these potentials.

In a message from Brazil, host of COP30, the report’s foreword calls for shifting the narrative from fear to hope: “We must prevent irreversible harm but equally trigger positive tipping points that propel societies towards low-carbon and climate-resilient development.” This vision centers the Global South’s pioneering efforts in regenerative agriculture, forest restoration, and climate finance innovation.

Critical governance challenges remain as the report stresses the need for anticipatory, justice-centered, multi-scale approaches linking human rights with climate action. International cooperation, transparent monitoring, and empowering Indigenous peoples and local communities stand out as pillars to navigate this precarious climate crossroads.

COP30 represents a decisive moment. The report concludes, “The time to act is now. United, we can reverse dangerous climate trajectories and trigger a global wave of renewal. Let us change by choice, together.”

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Global Report Reveals Planetary Health Communication Crisis Fuelled by AI and Misinformation

Global report reveals planetary health communication crisis fuelled by AI misinformation threatens climate action and vulnerable communities.

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AI-created image/For representative purpose

A new report launched yesterday at the Planetary Health Annual Meeting in Rotterdam has exposed a critical failure in global health communication that experts warn could undermine humanity’s response to interconnected climate and health crises.

The comprehensive study, titled “Voices for Planetary Health: Leveraging AI, Media and Stakeholder Strengths for Effective Narratives to Advance Planetary Health,” represents the first systematic mapping of how planetary health issues are communicated worldwide. Developed by the Sunway Centre for Planetary Health at Sunway University and implemented by Internews, the research reveals that communication—not scientific knowledge—has become the critical bottleneck preventing effective action on environmental health emergencies.

Fragmented Messages

The study’s findings paint a troubling picture of the global communication landscape. Despite mounting scientific evidence about the interconnected health threats from climate change, biodiversity loss, and pollution, public discourse remains severely fragmented and increasingly vulnerable to misinformation.

“We know the science. What we lack is a shared story that resonates across communities, cultures, and decision-makers,” said Prof. Dr. Jemilah Mahmood, Executive Director of the Sunway Centre for Planetary Health.

Prof. Dr. Jemilah Mahmood. Image credit: Sunway Centre for Planetary Health

The research, which analyzed 96 organizations and individuals across nine countries through in-depth interviews and social media analysis, found that planetary health communication efforts are often siloed within specific disciplines, limiting their reach and effectiveness. Many initiatives depend on short-term projects with minimal resources, leaving little capacity to build sustained narratives that could drive meaningful policy change.

AI: Double-Edged Sword

Perhaps most concerning is the report’s revelation about artificial intelligence’s dual role in planetary health communication. While AI presents opportunities for expanding access to reliable information and supporting multilingual communication, it also poses significant risks for spreading misinformation and deepening inequality.

Recent studies have documented how generative AI can be weaponized to create climate misinformation through bot-generated tweets mimicking climate deniers, deep-fake images of environmental activists, and sophisticated long-form content espousing false narratives. The technology can also amplify existing biases, with research showing that AI systems often privilege Western knowledge over Indigenous perspectives, potentially contributing to “global conservation injustices”.

The environmental cost of AI itself compounds the problem. Data centres now consume around 1.5% of global electricity, with AI-focused facilities requiring as much power as energy-intensive aluminium smelters. Training large language models like GPT-4 requires three to five times more energy than GPT-3, which already consumes enough electricity to power 120 American homes for a year.

Marginalized Communities Bear the Heaviest Burden

The communication crisis disproportionately impacts the world’s most vulnerable populations—precisely those most affected by planetary health emergencies. The report emphasizes that marginalized communities, including people of colour, low-income groups, and Indigenous peoples, face the greatest challenges in both accessing reliable health information and adapting to climate-related health threats.

Multiple studies confirm that racially and socioeconomically marginalized communities in the United States experience greater impacts from climate-related health events, including extreme heat, flooding, and respiratory illnesses. Children of colour are particularly vulnerable, experiencing disproportionate health impacts from climate exposures compared to white children.

The communication barriers compound these vulnerabilities. Scientific jargon makes planetary health concepts inaccessible to general audiences, while language delivery challenges—including complex English or lack of translation—further limit reach to non-English speaking communities.

Despite the communication challenges, the report identifies young people as both critical audiences and powerful communicators, particularly through digital platforms. Youth activists are increasingly using social media to drive environmental awareness and policy pressure, though they face significant obstacles including algorithmic bias and platform censorship concerns.

The research found that LinkedIn was most effective for professional audiences, while Instagram and TikTok showed promise for youth engagement, despite trust issues on some platforms. However, maintaining consistent and meaningful social media presence remains challenging for many organizations working with limited resources.

Strategic Solutions

To address these critical communication failures, the report proposes a revolutionary two-pronged strategy combining “strategic communication” to influence policy with “democratic communication” to foster community-level dialogue.

The approach rests on six core principles: ensuring marginalized voices shape the agenda; presenting planetary health as an integrated framework rather than disconnected crises; building bridges between disciplines and geographies; anticipating backlash and protecting communicators; tailoring messages to cultural contexts; and working within existing cognitive frameworks.

The research team has developed practical playbooks for different stakeholder groups and monitoring frameworks to track communication effectiveness—tools they argue could be transformative if adopted widely across the planetary health community.

“Communication is not just a tool; it is a catalyst for change. By speaking with courage, coherence, and compassion, and equipping all actors to tell inclusive stories, we can turn knowledge into action and ensure no voice is left behind,” said Jayalakshmi Shreedhar of Internews.

Jayalakshmi Shreedhar/Credit: Sunway Centre for Planetary Health  

The report’s launch comes at a critical moment, as policy rollbacks in major economies threaten to undermine decades of environmental progress. The study documents how recent reversals, including the United States’ withdrawal from climate agreements and defunding of health agencies, have weakened the systemic response needed to address planetary health crises.

With six of nine planetary boundaries already crossed and climate-related health impacts accelerating globally, experts warn that the window for effective communication and coordinated action is rapidly closing. The success of humanity’s response to interconnected environmental and health crises may ultimately depend on our ability to tell a coherent, compelling story that mobilizes action across all levels of society.

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COP30

Bridging the Adaptation Finance Gap: India’s Case Before COP30

As COP30 approaches, India faces a widening adaptation finance gap, despite rising climate impacts and mounting economic losses

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Policymakers and climate finance experts at a New Delhi roundtable call for fair and accessible adaptation finance ahead of COP30 — stressing that India’s resilience depends on aligning data, policy, and local action. Illustrated image/EdPublica

With COP30 in Brazil less than a month away, the world’s attention is turning to the elusive promise of adaptation finance — money meant not for cutting emissions, but for surviving their consequences. In New Delhi this week, a closed-door High-Level Roundtable on Adaptation Finance, organised by Climate Trends, brought together senior policymakers, economists, and global climate finance experts. The message that emerged was stark: India’s adaptation needs are vast, but the money isn’t flowing.

According to international estimates, while adaptation finance globally rose from USD 22 billion to USD 28 billion in 2022, developing countries require more than USD 350 billion annually to protect lives and livelihoods. India’s share of that unmet need remains enormous — and more than 60% of global adaptation finance still comes as loans, piling additional debt on already stressed economies.

“The geopolitics of the world is at an inflection point,” said Aarti Khosla, Director of Climate Trends. “Countries are wrestling with how to make the Global Goal on Adaptation practical and measurable. India is preparing to submit its first National Adaptation Plan. The quality of the finance also matters — because commitments made at multilateral fora are only as good as the systems that deliver them.”

The Growing Cost of Climate Impacts

India’s climate vulnerabilities are intensifying. Record-breaking heatwaves, erratic monsoons, floods, and agricultural losses have already dented GDP growth, with studies suggesting climate-linked economic damage could shave off 2–3% of India’s GDP by 2030. The country’s adaptation costs, as projected by several national and international assessments, could run into tens of billions annually.

Yet, domestic and international systems remain mismatched to that reality. “Adaptation needs to be built into a profitable market system that attracts private investment and creates entrepreneurial enterprise,” argued Abhishek Acharya, Director at the Ministry of Environment, Forest and Climate Change (MoEFCC). “We need a strong policy framework that enables even the last tier of governance — municipalities, panchayats — to access funding.”

The challenge, experts noted, isn’t just about the quantum of funds, but their design. India’s adaptation funding is fragmented across ministries and states, with little clarity on effectiveness. “We should be looking at adaptation-relevant expenditures,” said Amrita Goldar, Senior Fellow at the Indian Council for Research on International Economic Relations (ICRIER). “Looking through budgets at both central and state levels is a big task by itself. For adaptation, we don’t even have a sense of how technologies will evolve. When technologies are niche, private finance will not lead — public finance must.”

The Global Architecture and Local Realities

The Global Goal on Adaptation (GGA), first established under the Paris Agreement, remains largely conceptual — a vision still waiting for metrics. COP30 could change that, with countries expected to finalise indicators for tracking adaptation progress. Yet, experts warn that measurement alone won’t build resilience.

“If GGA indicators get finalised at COP30, they will become a yardstick for evaluation and performance,” said Pushp Bajaj, Programme Lead at Council on Energy, Environment and Water (CEEW). “But just measuring progress isn’t enough. The connections with real climate challenges must be explicit, and India should take a strong stand.”

For India, where agriculture, water, health, and heat stress are already colliding crises, effective adaptation requires reforming both global finance flows and domestic fiscal systems. Kathryn Miliken, Senior Climate Change Specialist at the Asian Development Bank (ADB), noted that adaptation finance forms only about 10% of total climate finance worldwide. “ADB is aiming for 30% of its portfolio to go toward adaptation,” she said. “But the larger challenge is mainstreaming adaptation into economic planning. It still hangs loosely as a standalone agenda.”

Governance Gaps and Subnational Needs

At the state and district levels, limited financial autonomy has hindered locally relevant adaptation measures. Arjun Dutt of CEEW observed, “Coastal embankments, water shelters — these are public goods. Local authorities are directly involved, but though we have devolution in the Constitution, financial powers have not been devolved.”

Experts argued that subnational access to climate finance — through mechanisms like resilience bonds, blended finance, and state adaptation funds — could be the next big step. “Adaptation is a local issue,” said Amir Bazaz, Head of Infrastructure and Climate at the Indian Institute for Human Settlements (IIHS). “We don’t have the capacity to develop projects that are locally embedded, and resources are insufficient. Investments are largely driven by returns, not resilience.”

The Politics of Adaptation

Beyond numbers, adaptation is deeply political. “We understand the global game of power evolving around energy,” said Ambassador Manjeev S. Puri, Distinguished Fellow at TERI. “It’s time for us to talk about adaptation in a louder manner — both locally and globally. Link adaptation to resilience, and you will find political buy-in.”

Ovais Sarmad, Vice Chair of the Greenhouse Gas Protocol, added a sobering global view: “We’re living in a world that’s moved from VUCA — volatile, uncertain, complex, ambiguous — to BANI — brittle, anxious, non-linear, incomprehensible. India must be actively engaged in discussions at the Standing Committee on Finance. Our position must be clear and people-centred.”

The Standing Committee on Finance (SCF), part of the UNFCCC structure, plays a key role in shaping how climate funds are allocated and monitored — including reforms in Multilateral Development Banks (MDBs). Several participants at the roundtable called for MDBs to increase concessional finance and reduce the loan-heavy structure of current adaptation flows.

For experts like Purnamita Dasgupta, Head of the Environmental and Resource Economics Unit at the Institute for Economic Growth, the way forward lies in clarity and pragmatism. “We want a lot of things, but we need to split this conversation into high-level messages and those we keep within our borders,” she said. “There’s no case for being overwhelmed. Development is the only solution. We should not wait for a magic number, nor ignore it.”

The final consensus from the roundtable was clear: India’s leadership on adaptation finance will depend on how well it aligns data, policy, and diplomacy. As the country prepares to submit its first National Adaptation Plan (NAP) to the UNFCCC, its approach could influence not just negotiations at COP30, but also how the Global South reframes adaptation as a cornerstone of economic growth.

“Adaptation is no longer a technical footnote to mitigation,” Khosla concluded. “It’s about protecting people, ensuring justice, and redesigning the financial systems that decide who gets to survive the climate crisis — and how.”

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