Due to the effects of climate change, and consequential conflict, it is likely that we are entering a period of increased human migration. Wealthier countries, even if able to adapt to the worst effects of climate change itself, will be wholly unable to escape the pressures of inbound immigration - particularly from regions that suffer most acutely from a heating planet.  This presents serious moral and political problems that must be dealt with head-on by people on both sides of the political spectrum.