Children born now may live in a world where the US can only produce half as much of its key food crops

[markodochartaigh]

5. RuBisCo activase is heat intolerant

and many grain crops are grown in areas where there are many days close to the maximum level of tolerance. Without RuBisCo the photosynthesis that most staple crops need to produce our food cannot happen.
It has been almost two decades since I saw Col. Larry Wilkerson, Colin Powell's chief of staff, give a talk where he said that he had been told by a NASA climatologist that, under a worst case scenario, there would be only enough arable land on the Earth for 400 million people by 2100. Since then it seems that the IPCC worst case scenarios are routinely exceeded.