Now a days everyone uses a search engine. The most popular without any doubt is Google.

However there are alternatives and I am intending to present you one of them: the Ecosia search engine.
“Ecosia is the search engine that plants trees with its ad revenue. Get the free browser extension and use Ecosia every time you search.”

They use their revenues to plant trees. Untill now, they have managed to plant over 5,5 million trees, with a new tree planted each 11 seconds. Their goal is to reach one billion planted trees by 2020. Ecosia has 2 million active users.

Here you can find more info:
https://info.ecosia.org/what