It uses Bing.

It's typical greenwashing though. Plant a few trees so you don't have to feel bad about the energy use. But it's all short term monoculture forests they're planting. Not destroying the real forest we have left is the better option. But yeah that's hard, you can't claim that as a quick win and make a lot of money off of it.

These initiatives are so small that they don't make a dent in the actual problem and for every "green" kilowatt hour some other factory burns extra coal because there's no green capacity left.

All ecosia does is give people who are mildly environmentally conscious an excuse to not feel guilty, and making good money off it. It's just like the 2$ carbon offset fees on flights. No way that tiny amount actually offsets anything of course. It's just someone getting rich of absolving others' guilt.