A simple website that displays the approximate number of trees currently on earth. You are free to use this number for your own use.
Go to http://moaufmklo.github.io/howmanytreesarethere to view the amount of trees and see donation options.
The calculation itself is pretty simple and straight-forward:
Subtract the seconds between now and January of 2015 multiplied by the amount of trees cut down every second (475.64...)
Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.