95. Is the World on the Brink of a Mass Extinction Event?

It’s not unusual for species to go extinct; it happens all the time. In fact, scientists estimate that at least 99.9% of all species of plants and animals that have ever lived on Earth are now extinct. That’s pretty amazing, considering how many species still exist—up to 8.7 million, according to some experts. Mass extinction events, however, are not so common. A mass extinction event is when more than half of all species living at a given time go extinct over a relatively short period. The American Museum of Natural History found five significant mass extinction events in the Earth’s history that it thought were worth highlighting on the museum’s website. The largest of these happened about 250 million years ago, when up to 95% of existing species died out. Another that people may find particularly noteworthy occurred 65 million years ago. That one took out the dinosaurs, marking a major turning point in history. What hasn’t happened in the past is a mass extinction event caused by humans. However, Richard Heinberg, author of the soon-to-be-released book titled Power: Limits and Prospects for Human Survival, thinks that may be coming, and some of the reasons are detailed in his 416-page book. “The book is a ‘big picture’ book, and I address three huge questions in it. One is: How did we—just one species—come to overpower the rest of nature to the point where we’re changing the climate and triggering what looks like it may be a mass extinction event? The second question is: How have we come to oppress one another in so many and so brutal ways? And the third is: Is there any way we can come to terms with power in such a way as to turn things around?” Heinberg said as a guest on The POWER Podcast. Heinberg said people around the world must switch from fossil fuels to alternative energy sources to limit climate change, but he was pessimistic about the prospects for doing so quickly enough to make a difference in the long term. “It’s going to be very, very difficult to do that in fact, and for a number of reasons,”