Does your search engine plant trees when you search for stuff online?
If not, please take a look at Ecosia.org.
It's a rather amazing search engine because every time you search you can help plant a tree and it won't cost you anything! On average it takes 45 searches to plant a tree but these days that won't take long to add up!
Ecosia's goal is to plant one billion trees and they've just hit the 40 million tree mark - so 40 million trees have been planted as a result of people using their search engine to search for stuff online.
Not only that, but you can buy t-shirts - and they'll plant 20 trees for every t-shirt you buy. I bought one and I love the quality and feel of it - and best of all, I know my purchase is helping to plant trees :-)
So take a look at Ecosia and plant trees as you search!