Remember when we used just one earth?
What about the green lung?
The Amazon is one of the most precious and impressive rainforests on Earth. It's described as the world's green lung because it sucks up so much carbon dioxide. But mankind uses lots of wood and the lung is shrinking. Its area fell from 4,100,000 square kilometers in 1970 to 3,300,000 square kilometers in 2016. In other words, 81 percent of 1970's forest cover still remains. (Source: Mongabay)