With climate extremes dominating the global news cycle in 2023, from record heat both on land and at sea to devastating wildfires and floods around the world, the need to address climate change is more apparent and urgent than ever.
New research commissioned by the High Level Panel for a Sustainable Ocean Economy (Ocean Panel) shows that ocean-based climate solutions can deliver up to 35% of the annual greenhouse gas emission cuts needed in 2050 to limit global temperature rise to 1.5 degrees C (2.7 degrees F) — the threshold scientists say is necessary to avert the worst outcomes from climate change. This represents a significant increase from previous estimates, which put the ocean''s potential emissions reductions at around 21% of the total needed by 2050.
This research is based on solutions that are ready to implement and economically viable today. But while investments in a sustainable ocean economy are seen to be profitable — with data showing that investing $1 in key ocean actions can yield at least $5 in global benefits, often more, over the next 30 years — finance for these solutions has largely been lacking to date. Countries must substantially increase investments in the necessary technology and infrastructure if we are to take full advantage of the ocean''s ability to help tackle the climate crisis.
Ocean-based renewable energy is a major area of opportunity with ready-to-implement solutions — including offshore wind as well as floating solar and tidal power — which could slash greenhouse gas emissions by up to 3.60 gigatonnes per year in 2050. That''s more than the total combined emissions for all 27 EU member states in 2021. Increasing deployment of renewables will also be critical to meeting global energy demand as the world works to phase out coal and other fossil-based energy sources.
Currently, the international shipping industry carries about 80% of the world''s trade between nations; if counted as a country, it would be among the world''s top-10 largest emitters. In a bid to align more closely with global climate goals, the International Maritime Organization (IMO) recently revised its emissions-reduction strategy, setting a target to reach net zero "by or around" 2050 according to "national circumstances."
While some progress has been made toward decarbonizing ocean-based transport over the last decade — primarily through energy efficiency measures such as redesigning and refurbishing ships to reduce fuel use and lower emissions — meeting the sector''s net-zero goals will require much more investment in both existing and emerging low-carbon shipping solutions.
Healthy "blue carbon" ecosystems such as mangrove forests, seagrass meadows and tidal marshes are powerful carbon sinks that can store up to 5 times more carbon per area than tropical forests and absorb it from the atmosphere about 3 times as quickly. This makes them an important — though often overlooked — ally in tackling the climate crisis.
Beyond their ability to remove and store carbon from the atmosphere, these ecosystems also offer myriad co-benefits that can support sustainable development and climate resilience, particularly in vulnerable coastal areas. They sustain economies through fisheries and tourism, provide crucial habitat for diverse marine species and help enhance freshwater quality, all while buffering coastal communities from the impacts of increasingly extreme weather events like cyclones.
However, blue carbon ecosystems are disappearing at a rapid pace, driven by the "coastal squeeze" between climate-driven impacts (including sea level rise and extreme weather events) and development of coastal areas. Action to address and reverse this degradation has been woefully inadequate to date.
Enhanced efforts to conserve, restore and sustainably manage blue carbon ecosystems can contribute significantly to global climate targets — removing greenhouse gas emissions equivalent to 76 coal-fired power plants per year in 2050 — while also helping achieve the goals of the Convention on Biological Diversity (including 30 by 30) and the UN''s Sustainable Development Goals.
As the global population rises, so, too, will the need food and protein sources. The ocean can play a key role in meeting this need with a wide range of sustainable seafoods — such as algae, fish and invertebrates like shellfish — which are less land intensive and require fewer resources to produce than options like beef and lamb. Incorporating these "blue" foods into global diets not only diversifies protein choices but could also reduce global emissions by up to 1.47 gigatonnes per year in 2050, comparable to removing 393 coal fired power plants annually.
However, while these foods are common in some cultures, awareness and use of them remains limited at a global scale and prices are sometimes prohibitively high for consumers. More must be done by governments and industry to raise awareness, send clear policy signals (such as subsidizing these foods) and invest in an enabling environment to take advantage of this opportunity.
Some countries are starting to do this. Australia, for example, is investing AUD $70 million (US $45 million) in the Blue Economy Cooperative Research Centre to bring together expertise in aquaculture, marine renewable energy and marine engineering as part of a collaborative effort between industry, researchers and the community. It aims to develop innovative and sustainable offshore industries to increase Australian seafood and marine renewable energy production.
The latest climate science recognizes that, in addition to deep emissions cuts across all sectors, meeting global climate goals will require removing some of the carbon that''s already been emitted into the atmosphere. Alongside restoring blue carbon ecosystems which absorb CO2 naturally, ocean-based carbon removal approaches, including marine carbon dioxide removal and carbon capture and storage in the seabed, have sparked interest globally in recent years.
Carbon capture and storage involves harvesting carbon from the atmosphere through direct air capture or waste combustion and pumping the liquified carbon into chambers below the seabed, where it can be stored permanently. These methods are currently more mature than marine carbon dioxide removal techniques and could provide up to 1 gigatonne of emission reduction potential in 2050 if current deployment trajectories continue.
While research into ocean-based carbon removal technologies should be accelerated, it should not be a reason to delay solutions that are already viable and ready to implement today — such as offshore wind, marine ecosystem restoration and conservation and increasing low-carbon food from the sea.
Coastal and marine tourism represents at least 50% of total global tourism. It also constitutes the largest economic sector for most small island developing nations and many coastal ones. But, while critical to these countries'' economies, cruise tourism is also a considerable polluter: One recent study found that a large cruise ship can have a carbon footprint greater than 12,000 cars. Cruise ships also emit other pollutants besides carbon dioxide — such as sulfur oxides, nitrous oxides and particulate carbon — that can harm marine ecosystems as well as human health.
The world cannot tackle the climate crisis without drastically reducing fossil fuel production and consumption. Phasing down offshore oil and gas offers the largest opportunity for ocean-based climate action, with the potential to eliminate up to 5.30 gigatonnes of greenhouse gases annually in 2050, equivalent to taking about 1.1 billion fossil-fuel cars off the road each year. This assumes that energy demand formerly supplied by fossil fuel generation can be met by a parallel increase in zero-emission energy sources (such as ocean-based renewables).
To help accelerate this transition, governments can withdraw fossil fuel subsidies in countries which currently provide them; enact legislation and/or regulations to ban routine flaring (a method and current practice for disposing of large unwanted amounts of associated petroleum gas); stop new licensing for offshore oil and gas extraction; and invest public finance in energy security and access for the most economically vulnerable communities.
These ocean-based climate solutions could potentially exceed one-third of the total emissions reductions needed to meet global climate goals — but that''s not all. They can also contribute to the development of a sustainable ocean economy and may come with a wide range of co-benefits, including protecting coastal communities from storms, providing jobs, protecting biodiversity and improving food security.
However, these benefits can only be realized if investments are made in developing the technology and infrastructure needed for full implementation. Fulfilling the ocean''s potential in emissions reductions will require at least $1 trillion of additional finance between now and 2030, increasing toward $2 trillion between 2030 and 2050.
These investments must be applied intelligently across each sector to maximize impact. Where finance is already available (for example with offshore renewable energy), it needs to be fully directed toward strategies that align with net-zero pathways. Where funding is scarce, such as is the case for blue carbon solutions, de-risking, guarantees and blended finance can help by making investing in these solutions more attractive.
New research commissioned by the Ocean Panel lays out how these ocean-based climate actions can be fully leveraged to help put the world back on track to 1.5 degrees C. To learn more, see: The Ocean as a Solution to Climate Change: Updated Opportunities for Action.
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