As per the new study conducted by a team of researchers, there are over 3 trillion trees on the earth. The study was published in the journal Nature on 2 September 2015 with a title Mapping tree density at a global scale. The study was conceived by TW Crowther and HB Glick.
As per the study, the global number of trees is approximately 3.04 trillion, an order of magnitude higher than the previous estimate. The previous estimate was 400 billion trees and that rough count was based on satellite images peering down from space.
Crowther and colleagues used 429775 ground-based measurements along with satellite measurements and computer models to get a more accurate figure.
Findings of the Study
• Out of 3 trillion trees, approximately 1.39 trillion exist in tropical and subtropical forests, with 0.74 trillion in boreal regions and 0.61 trillion in temperate regions.
• Based on projected tree densities, it is estimated that over 15 billion trees are cut down each year. That is a net loss of 10 billion trees a year. At that rate, all of Earth's trees will be gone in about 300 years.
• The global number of trees has fallen by approximately 46 percent since the start of human civilization. Before human civilization, Earth had about 5.6 trillion trees.
• The Biome-level trends in tree density demonstrate the importance of climate and topography in controlling local tree densities at finer scales, as well as the overwhelming effect of humans across most of the world.
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