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.
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.
More Ways to Support Climate Solutions
Giving Green Fund
One fund. Global impact. One hundred percent of your gift supports a portfolio of high-impact climate organizations, vetted by our research.
Best for:
Donors who want the simplest way to impact multiple climate solutions.
Support Our Work
We thoroughly research climate initiatives so you can give with confidence. For every $1 we receive, our work unlocks another $21 for effective climate solutions.
Best for:
Donors who want to amplify their impact through research.
