Search engine Ecosia plants trees in exchange for searches. It uses pay-per-click ads to fund projects that positively impact both people and nature.

Ecosia is a search engine with a difference. For roughly every 45 searches made, the Berlin-based company plants a tree. And Ecosia measures its success not based on how much money it makes, but on how many trees it has planted - and it's planted almost 126 million so far, at a current rate of one tree per second.