Best Environment & Animal Charities to Donate To (2026) — Ranked

From wildlife conservation to animal shelters to climate advocacy, the environment and animal welfare sector includes 247 nonprofits in our database. The sector averages 73/100 on our Efficiency Score, with 55 organizations earning an A grade. Here are the charities making the most of every donated dollar.

Top 25 Most Efficient Environment & Animal Charities

Rank	Organization	Score	Revenue	Grade
1	Best Friends Animal Society	87	$173.5M	A
2	Wildlife Conservation Network Inc	87	$52.5M	A
3	The Wild Animal Sanctuary A Colorado Non Profit Corporation	87	$33.9M	A
4	Michigan Humane Society	87	$27.8M	A
5	Massachusetts Society For The Prevention Of Cruelty To Animals	86	$120.3M	A
6	National Arbor Day Foundation	86	$99.1M	A
7	The Recycling Partnership Inc	86	$37.1M	A
8	American Society For The Prevention Of Cruelty To Animals	85	$379.3M	A
9	Paintcare Inc	85	$78.8M	A
10	Multiplier	85	$75.0M	A
11	Earth Island Institute Inc	85	$34.9M	A
12	African Wildlife Foundation	85	$33.7M	A
13	Marine Stewardship Council	85	$33.6M	A
14	Wvc	85	$26.5M	A
15	Bonneville Environmental Foundation	85	$22.1M	A
16	Trust For Public Land	84	$297.4M	A
17	International Sustainable Energy Foundation	84	$36.9M	A
18	Iso New England Inc	83	$235.6M	A
19	San Diego Humane Society And S P C A	83	$67.2M	A
20	Partnership Project Inc	83	$41.1M	A
21	California Waterfowl Association	83	$27.0M	A
22	Nia Tero Foundation	83	$26.2M	A
23	Neighborhood Recycling Corporation	83	$22.7M	A
24	Point Reyes Bird Observatory	83	$20.7M	A
25	New England Interstate Water Pollution Control Commission	83	$19.2M	A

See the full list on our environment & animals efficiency ranking page.

What Makes an Environmental Charity Efficient?

Program spending above 80%: Funds going directly to conservation, habitat restoration, animal rescue, or environmental education.
Measurable impact: Acres protected, species monitored, animals rescued — the best organizations track and report outcomes.
Diversified funding: Not overly dependent on a single grant or government contract.
Proportionate leadership pay: Executive compensation that reflects the organization’s scale.

Frequently Asked Questions

What are the most efficient environmental charities?

The most efficient environmental charities direct 80% or more of expenses to conservation, advocacy, research, and habitat protection programs. Our Efficiency Score ranks them using IRS 990 data on program spending, revenue growth, reserves, and executive pay.

How do animal welfare charities compare to environmental charities?

Both fall under the Environment & Animals NTEE category. Animal welfare charities (shelters, rescue organizations) tend to be smaller and more locally focused. Environmental organizations (conservation, climate advocacy) are often larger with national or global reach. Efficiency varies in both sub-categories.

Do environmental charities spend too much on advocacy?

Advocacy is a legitimate program expense for environmental nonprofits. Policy change can have outsized impact — a successful clean air regulation affects millions of people. Advocacy spending counts as program spending in 990 filings, not overhead.

About This Data

All data from IRS Form 990 filings via ProPublica Nonprofit Explorer API. See our methodology.