A grassroots campaign to plant trees around the globe has announced that it is raising its target from 1 billion trees to 7 billion trees, the United Nations announced today.

The campaign, which is under the patronage of Nobel Peace Prize Laureate and Kenyan Green Belt Movement founder Professor Wangari Maathai and Prince Albert II of Monaco, also announced today that in 18 months it has seen two billion trees planted, double its original target.