Giving Green's

List of Top Climate Nonprofits

Our Data-backed
Picks for Climate Impact

(2025-2026)

Giving Green’s annual list of Top Climate Nonprofits spotlights organizations with the highest potential to reduce emissions and drive long-term, systemic change. Each pick is vetted through our rigorous, research-backed framework — prioritizing scale, feasibility, and funding need — to help donors give where it matters most.

To give to each nonprofit directly, visit their website. Or, let Giving Green distribute your donations among these organizations and more through the Giving Green Fund.

Organizations are listed in alphabetical order. The order in which they are listed should not be misinterpreted as a reflection of their importance or effectiveness.

Clean Air Task Force

Having had a successful track record of pushing for climate solutions in the U.S., Clean Air Task Force (CATF) is now going global. By identifying barriers
to technology deployment, engaging with stakeholders, and advocating for supportive policies, CATF aims to speed up the growth of low-carbon technologies to reduce emissions broadly and quickly.

We are particularly impressed that CATF has built momentum for areas of innovation that need more funding support, such as super hot rock geothermal energy, zero-carbon fuels, and the decarbonization of aviation and maritime shipping.

Future Cleantech Architects

For hard-to-abate sectors like heavy industry and aviation, we do not yet have the tools to reach net zero. Future Cleantech Architects works across technical research & policy engagement to advance innovation in critical areas often neglected by funders and governments.

We were impressed by Future Cleantech Architects’ depth of  in-house expertise and evidence of its meaningful influence on EU climate policy.

Good Food Institute

Livestock production is responsible for at least 10% of global emissions – livestock belch methane, require substantial (often deforested) grazing land, and contribute to general supply chain emissions. The Good Food Institute (GFI) seeks to make alternative proteins as affordable and delicious as conventional products. It pushes for more government funding for research, fights for fair labeling, and helps cultivated meat get to market.

We think GFI is a powerhouse in supporting alternative proteins, with impressive wins under its belt.

Opportunity Green

Aviation and maritime shipping are challenging sectors to decarbonize and have not received much support from philanthropy in the past. Opportunity Green pushes for ambitious regulations, promotes clean fuels, encourages companies to adopt greener fleets, and works to reduce demand for air travel.

We are especially excited about Opportunity Green’s efforts to elevate climate vulnerable countries in policy discussions, as we think this could improve the inclusivity of the process and the ambition level of policies.

Project InnerSpace

Deep underground, the Earth’s crust holds abundant heat that can supply renewable, carbon-free heat and reliable, on-demand electricity. 
Project InnerSpace is fast-tracking next-generation technologies that can make geothermal energy available worldwide. It has a bold plan to reduce financial risks for new geothermal projects, making geothermal energy cheaper and more accessible, especially in densely populated areas in the Global South.

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