Dust to Dust

Apr 20, 2014
Charles Peales

Scientists project that nearly 20,000 species across the globe are at a high risk of extinction, and that within the next 300 years, some 75 percent of all mammals could completely disappear from Earth. Experts say that we are in the middle of the sixth mass extinction of life on earth. And what distinguishes it from the previous five extinctions is that it is being caused by humans.