Methane-producing microbes may be responsible for the largest mass extinction in Earth's history

Evidence left at the crime scene is abundant and global: Fossil remains show that sometime around 252 million years ago, about 90 percent of all species on Earth were suddenly wiped out—by far the largest of this planet's five known mass extinctions. But pinpointing the culprit has been difficult, and controversial.

Read the whole article on Physorg

More from Physorg