Read at : ENB - IISD

http://www.iisd.ca/media/intergovt_orgs2008.htm#unep

UNEP TREE-PLANTING CAMPAIGN TO CONTINUE DURING 2008

The UN Environment Programme’s (UNEP) Plant for the Planet: Billion Tree Campaign, which successfully reached its target to plant one billion trees worldwide during 2007, has now expanded its objective to plant one billion more trees in 2008. It thus continues to encourage communities, business and industry, civil society organizations and governments to enter tree planting pledges online.

Link to further information
UNEP Plant for the Planet: Billion Tree Campaign website