15 Billion Trees is Lost in Every Years
Bogor, September 8, 2015
There are more than three billion trees found on Earth. However, the number has decreased 46 percent since the advent of human civilization.
It was revealed from the results of a study published in the journal Nature. The study was conducted by a team of researchers, using satellite imagery, forest inventory and technology to map the number of trees per square kilometer.
"The tree including the most prominent and important organisms on Earth, but we have only recently begun to understand the global reach and the distribution," said the study's lead author, Thomas Crowther, from the Faculty of Forestry and Environmental Yale University.
Crowther said, he was surprised because the study was to find so many trees. According to previous estimates, the number of trees reach 400 billion cigarettes, while Crowther study found the number of trees reach 3.04 trillion, or an average of 422 trees per person.
Russia, Scandinavia and North America in the Arctic sub region has a density level or highest tree density, while the tropical region has the largest number of trees, about 43 percent of the number of trees in the world.
According to Crowther, man is a factor that gives the greatest influence in determining the existence of the number of trees around the world. He said that the density of the tree fall dramatically when the human population increases. Deforestation and other human activities have caused the number of trees reduced by 15 billion every year.
"We have reduced almost half the number of trees in the earth, and we have seen its effects on climate and human health," said Crowther.
Source: voaindonesia.com (040915)