That catastrophic fact is not something that may happen in the future, quite to the contrary, it is happening now and will only get worse. In the 'developing world', Asia, Africa, and Latin America the threat of mass starvation faces two and a half billion people!
The United Nations Food and Agriculture Organization estimated that one person in every two in the world is badly nourished, and that one in three is chronically hungry.
Currently there is food available but as climate change takes a stronger hold on the planet, that will no longer be the case... food will be unavailable and those wanting to eat will be forced to participate in 'food riots'.
While we claim to see improvements in human circumstances from prehistory until now, the truth is that, for the first time, we are reasonably well looking at the end of the line... many credible scientific thinkers do not believe humans will finish out this century.