Ecosia is now available as a default search engine on Brave.
Ecosia is a search engine that uses its profits to plant trees, so far over 115 million trees have been planted. The search results are delivered by Bing and modified by its own algorithm.
The tree planting projects are presented here.
https://blog.ecosia.org/tag/where-does-ecosia-plant-trees/
Ecosia's privacy policy can be found here.
https://info.ecosia.org/privacy
Ecosia claims to anonymize the search history within a week, but Bing deletes the search history and IP address provided by searches on Ecosia only after 18 months, according to its privacy policy.
Here is an article that describes how to further protect privacy on the Internet.