Snap, as in 'take a picture of', of course!
To celebrate World Forestry Day on 21st March, Christian wildlife conservation charity A Rocha and its climate change initiative, Climate Stewards, are on a mission to plant up to 800 trees and need your photos in order to reach their goal!
For every photo of a tree that you share on their Flickr page before 21st March 2012, they will plant one tree.
More details here: http://www.flickr.com/groups/arocha-forests
Does this count?