The organisations actually doing the work.

The world's largest voluntary carbon credit registry. The VCS Programme has issued over one billion carbon credits across 1,900+ projects in 80+ countries — becoming the de facto global standard for voluntary offset verification.

Founded by WWF and other NGOs, Gold Standard certifies carbon projects that deliver measurable contributions to UN Sustainable Development Goals alongside verified emissions reductions. Widely regarded as the most rigorous voluntary standard.

The first private voluntary greenhouse gas registry in the world, founded in 1996. ACR operates rigorous offset standards across forestry, agriculture, and industrial sectors, with credits recognised by the California cap-and-trade programme.

Developing and deploying technology to rid the world's oceans and rivers of plastic. Their passive collection systems operate in the Great Pacific Garbage Patch, while Interceptor vessels capture riverine plastic before it reaches the ocean.

Marine conservation NGO restoring coral reef ecosystems in Indonesia and the Pacific. Uses coral gardening, substrate attachment, and community-based monitoring to rebuild degraded reefs and protect marine biodiversity.

A global programme promoting coastal ecosystem conservation — mangroves, seagrasses, and saltmarshes — as a carbon sequestration strategy. Coastal blue carbon ecosystems sequester carbon at rates up to 10x faster than terrestrial forests.

Restores forests across 8+ countries by employing local communities as restoration workers — combining ecological and economic recovery. Projects span Madagascar, Nepal, Haiti, Mozambique, Indonesia, and beyond.

Trains farmers in sub-Saharan Africa to plant diverse agroforestry systems that restore degraded land, improve food security, and sequester carbon. Their Forest Garden Approach transforms subsistence farming into sustainable food production.

UK charity working in direct partnership with rainforest communities in the Amazon, Papua New Guinea, and Cameroon to protect endangered forest from within. Communities retain sovereignty — Cool Earth funds what they ask for.

One of the world's largest conservation organisations, operating in 76 countries to protect critical land and water. Their NatureVest team structures conservation investments at scale, including verified forest carbon projects.

Accelerates native forest restoration at scale by supplying seeds, equipment, and operational systems to reforestation projects worldwide. Their seed bank and nursery technology enables restoration partners to grow native species at costs and speeds not previously possible.

Certifies sustainable agriculture and forestry operations across 70+ countries. Their Rainforest Alliance Certified seal covers farms producing coffee, cocoa, tea, and timber, embedding land-use practices that protect forests and support rural livelihoods.

Operates the world's largest direct air capture (DAC) plants in Iceland, permanently mineralising atmospheric CO₂ into basalt rock. Their Mammoth plant processes up to 36,000 tonnes of CO₂ per year — powered entirely by geothermal energy.

Injects captured CO₂ into fresh concrete during mixing, where it permanently mineralises into calcium carbonate. The process simultaneously reduces cement use and sequesters CO₂ in every cubic metre of concrete produced.

Ocean-based carbon removal company sinking biomass into the deep ocean where carbon is stored for centuries. Their kelp and wood-chip buoys absorb CO2 as they float, then sink to the seafloor. MRV-tracked credits verified by third-party auditors.

One of the world's largest carbon project developers and sustainability advisors. Originates and verifies carbon credits across 700+ projects in 50+ countries, advising Fortune 500 companies on net-zero strategy and carbon portfolio construction.

UK-based carbon market specialist (formerly Natural Capital Partners) operating the CarbonNeutral Protocol — the world's longest-running voluntary carbon neutrality standard. Advises corporate clients on verified carbon strategies.

Operates the world's largest spot marketplace for environmental commodities including voluntary carbon credits, renewable energy certificates, and water credits. The CBL exchange facilitates institutional trading of high-quality verified credits.

The UK's largest woodland conservation charity, protecting and restoring ancient woodland across Britain. Manages 1,000+ woodland sites and advocates for woodland creation at the scale needed for UK net-zero targets.

A network of 46 independent wildlife trusts managing 2,300+ nature reserves across the UK. Campaigns for 30x30 — protecting 30% of UK land and sea for nature by 2030 — and runs habitat restoration programmes across all UK habitats.

The UK's largest nature conservation charity, managing 200+ nature reserves across England, Scotland, Wales, and Northern Ireland. Campaigns on climate policy, land-use reform, and marine protection with decades of measurable habitat recovery.

The world's largest independent renewable energy company, headquartered in the UK. Develops, builds, and operates wind, solar, and energy storage projects across 24 countries — with over 20GW of renewable capacity delivered since 1982.

UK charity bringing affordable solar lights to sub-Saharan Africa, replacing kerosene lamps with clean pay-as-you-go solar. Over 3 million solar products sold across Malawi, Zambia, Tanzania, and Uganda — cutting CO2 while improving health outcomes.

A global initiative led by The Climate Group bringing together 400+ businesses committed to 100% renewable electricity — including Apple, Google, and Unilever — collectively demanding over 340TWh of renewable power annually.