Climate change is the force behind the greatest migration storm of all time. It will be 500,000,000 or maybe 2,000,000,000; nobody knows for sure how many, but as climate change worsens, the estimates go up. Climate change impacts us all because in a very real sense, we’ve all left home, migrated without really knowing it. A human being with rights, rights to go anywhere in the world, rights to leave a country. These are the people who did not cause climate change but feel its worst impact.