What's your citation for suspecting that more than 1 in 8 living people will be a migrant? That seems pretty alarmist, and well over any number I've seen suggested elsewhere.
- 19 countries with the highest number of ecological threats are among the world’s 40 least peaceful countries including Afghanistan, Syria, Iraq, Chad, India and Pakistan.
- Over one billion people live in 31 countries where the country’s resilience is unlikely to sufficiently withstand the impact of ecological events by 2050, contributing to mass population displacement.
- Sub-Saharan Africa, South Asia, the Middle East and North Africa are the regions facing the largest number of ecological threats.
- 3.5 billion people could suffer from food insecurity by 2050; which is an increase of 1.5 billion people from today.
- The lack of resilience in countries covered in the ETR will lead to worsening food insecurity and competition over resources, increasing civil unrest and mass displacement, exposing developed countries to increased influxes of refugees.
Well if current temperatures and predictions are anything to go by, big chunks of Iraq, Iran, Afghanistan, Pakistan, India and Bangladesh will become uninhabitable, wet bulb temperatures wise. Just from that area you can easily get to 1 billion; there's also Africa and the Americas that could experience droughts, destruction of wildlife habitats relied upon for sustenance (mostly fishing), unviable temperatures, floodings, etc.
Just look at the population figures for the areas of the globe that are projected to become uninhabitable. That's your baseline number and it by itself is over a billion people. Any additional extrapolation for political and social upheavals related to resource conflicts (regardless of how conservative your analysis might be) only add to that baseline.
Well, this is when the military budget of many countries will be put to a test, for real this time. After all, the reason to keep investing into military force is to be able to defend sovereignty. It is a harsh thought, no question, but we have to admit that we always prepared for this case. Sure, the left is trying to make it a humanitarian thing, but in the end, available space and resources will determine how much the people of a country are willing to accept foreigners. Right now, this "game" is very much leaning in favour of the left, however, one day, it will pivot, and then there will be only tears. The real question is, will you be able to migrate before the borders are closed with military force?