According to a new study on #climatechange it is possible that by 2070:
"∼3.5 billion people (roughly 30% of the projected global population) would have to move to other areas if the global population were to stay distributed relative to temperature the same way it has been for the past millennia"

Although, this is a theory that could lose accuracy over the next 50 years, delaying our transition to #renewables is certainly a bad idea!

Research article: https://www.pnas.org/content/117/21/11350