Global temperatures are on track to rise 3-5 degrees by the year 2100 , according to the United Nations Meteorological Organization. That level of climate change is anticipated to negatively impact every aspect of human life — from health to agriculture to the economy . The last time humans had to adapt to the changing environment on a global scale was hundreds of thousands of years ago , when homo erectus lived in Africa. An international team of geologists and anthropologists, among them Dan