A study led by researchers from Yale University revealed that earth is home to over 3 trillion trees, which means more than 400 trees person. The tree-count looks exciting, but according to the study, the total number of plants has fallen by about 46% since the beginning of human civilization.

The new estimate of tree population is about seven times more than some previous estimates of just 400 billion trees. The study, conducted by an international team of researchers, mapped the tree population by using forest inventories, satellite imagery and some advanced supercomputer technologies.

Thomas Crowther, a researcher from the Yale School of Forestry & Environmental Studies and study's lead author, said, "Trees are among the most prominent and critical organisms on Earth, yet we are only recently beginning to comprehend their global extent and distribution".

The team conducted the study after request from Plant for the Planet, a children's initiative that leads the 'Billion Tree Campaign' of United Nations Environment Programme. Crowther was approached by the team about two years ago and was asked about the tree numbers at regional and global level.

According to that time's estimates, earth had slightly more than 400 billion trees worldwide, which means just 61 trees per person. Those predictions were based on data from satellite imagery and forest area's estimation. The new study combined a number of effective approaches and found that the planet has more than three trillion trees.