ClickGreen reports on a satellite study of the number of trees on Earth:
A new satellite study has calculated that there are more than 3 trillion trees on Earth, around 422 trees for every person, although the number is believed to have dropped by 46 percent since the start of human civilisation.
The Yale-led international research found the result of the tree count is around seven and a half times more than some previous estimates.
Using a combination of satellite imagery, forest inventories, and supercomputer technologies, the international team of researchers was able to map tree populations worldwide at the square-kilometer level.
Their results, published in the journal Nature, provide the most comprehensive assessment of tree populations ever produced and offer new insights into a class of organism that helps shape most terrestrial biomes.
Read the rest of the story Satellite study of trees.