"A century ago, only 15 percent of the Earth's surface was used by humans to grow crops and raise livestock," he said. "Today, more than 77 percent of land—excluding Antarctica—and 87 percent of the ocean has been modified by the direct effects of human activities."

Five countries hold the vast majority of the world's remaining untouched wilderness — and Canada's one of them. Tha…https://t.co/r2d27b2SDf

A century ago, only 15% of earth’s surface was used to grow crops and raise livestock. Today 77% has been consumed…https://t.co/ROIwZx0Bwm