Add Yahoo as a preferred source to see more of our stories on Google. A year after a wildfire, the U.S. Forest Service assesses the damage to figure out how many trees need to be planted to restore ...

There are more than three trillion trees worldwide, but that’s only half as many as were around at the start of human civilisation, according to new research. The study, published today in Nature, ...

There are more than 3 trillion trees in the world, according to a fascinating study released in the journal Nature. The good news: That's more than seven times the earlier estimates of 400 billion ...