Human activity has severely degraded three-quarters of all land and 40 percent of the Earth’s oceans, and the accelerating destruction of nature is likely to have untold consequences on health and livelihoods, the World Wildlife Fund said in its annual Living Planet Report which tracks more than 4,000 species of vertebrates. Al Jazeera quotes the Report as saying that the average size of wildlife populations has plummeted more than two-thirds in less than 50 years because of deforestation and rampant overconsumption, warning that increasing deforestation and agricultural expansion were the key drivers behind a 68 percent average decline in populations between 1970 and 2016.