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Life on this planet has always been a balancing act—a complex web of interconnectivity that’s surprisingly fragile. Remove or even alter enough key components and that web begins to fray and fall apart. Such a collapse—or mass extinction—has happened five times in our planet’s geological past. The first struck four hundred million years ago, when most marine life died off. The third event hit both land and sea at the end of the Permian Period, wiping out 90 percent of the world’s species, coming within a razor’s edge of ending all life on earth. The fifth and most recent extinction took out the dinosaurs, ushering in the era of mammals and altering the world forever. How close are we to seeing such an event happen again? Some scientists believe we’re already there, neck-deep in a sixth mass extinction. Every hour, three more species go extinct, totaling over thirty thousand a year. Worst of all, the rate of this die-off is continually rising. At this very moment, nearly half of all amphibians, a quarter of all mammals, and a third of all reefs balance at the edge of extinction. Even a third of all conifer trees teeter at that brink. Why is this happening? In the past, such massive die-offs had been triggered by sudden changes in global climate or shifts in plate tectonics, or in the case of the dinosaurs, possibly even an asteroid strike. Yet most scientists believe this current crisis has a simpler explanation: humans. Through our trampling of the environment and rise in pollution, mankind has been the driving force behind the loss of most species. According to a report by Duke University released in May 2014, human activity has driven species into extinction at the rate a thousandfold faster than before the arrival of modern man.
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