Over the last several hundred million years, there have been many mass extinctions. Who caused the first & should we worry about the next?
What's The Best Way To Stop Mass Extinction? - http://bit.ly/2bkskfY
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History Of Life On Earth
"During its dramatic 4.5 billion year history, Earth has gone through a series of major geological and biological changes. The timescale below highlights a number of notable prehistoric events and the geological periods in which they occurred."
Newly Discovered Fossils Strengthen Proposition That World's First Mass Extinction Engineered By Early Animals
"Newly discovered fossil evidence from Namibia strengthens the proposition that the world's first mass extinction was caused by "ecosystem engineers" - newly evolved biological organisms that altered the environment so radically it drove older species to extinction."
Will Humans Survive The Sixth Great Extinction
"In the last half-billion years, life on Earth has been nearly wiped out five times-by such things as climate change, an intense ice age, volcanoes, and that space rock that smashed into the Gulf of Mexico 65 million years ago, obliterating the dinosaurs and a bunch of other species. These events are known as the Big Five mass extinctions, and all signs suggest we are now on the precipice of a sixth."
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