Ecosia.org operates as a search engine like any other, but with the added bonus that it plants trees with its ad revenue.
I switched a few months ago and it tells me that I’ve performed enough searches to plant 15 trees. That might not sound a lot, but their site boasts that they’ve planted 13.7 million trees! That’s up from 10 million in June, so that count is rising fast!
It takes zero effort and there’s no downside, so why not switch your default search engine to Ecosia today.