From the World Wildlife Fund report entitled, “Living Planet Report,” on loss of species. (By the way, the graphs use the acronym, “LPI,” which is translated as the “Living Plant Index,” which measures more than 10,000 representative populations of mammals, birds, reptiles, amphibians and fish. Those populations have declined by 52 per cent since 1970.
The World Wildlife Fund says: “Put another way, in less than two human generations, population sizes of vertebrate species have dropped by half. These are the living forms that constitute the fabric of the ecosystems which sustain life on Earth – and the barometer of what we are doing to our own planet, our only home. We ignore their decline at our peril.”
The report can be read here.