Jadav Payeng
To date he has single handedly planted a forest larger than Central Park NYC.
Jadav "Molai" Payeng (born 1963) is a environmental activist and forestry worker from Jorhat, India. Over the course of several decades, he planted and tended trees on a sandbar of the river Brahmaputra turning it into a forest reserve. The forest, called Molai forest after him, is located near Kokilamukh of Jorhat, Assam, India and encompasses an area of about 1,360 acres / 550 hectares. (http://en.wikipedia.org/wiki/Jadav_Payeng)