Sure, here you go: https://ecosia.zendesk.com/hc/en-us/articles/206019452-How-d...

Like any other search engine, Ecosia earns money from clicks on the advertisements that appear above and beside the search results.

The advertisements on Ecosia are clearly labeled as Ads and are text links to websites that pay for each click by users. The ads are delivered to you by our partner Bing, who pays Ecosia a share of the revenue generated via these ads.

Ecosia earns a few cents for every click on an ad from Bing – or a portion of the purchase price made through an affiliate link. Ecosia then gives the profits from this ad revenue to planting projects.

We also make a small income on commission from our online store. All profits we receive go towards our projects – which means we can plant 20 trees every time we sell a t-shirt.