Alarmists will tell you that global warming endangers the world's food supply. This is because they do not have a basic understanding of agronomic production. There are three things that crops need more than anything else to grow and produce high yields: heat, moisture, and carbon dioxide. Some crops can get too much heat, but even the worst predictions of global warming alarmists don't call for such temperatures. In most cases, increased temperatures will increase yields.
Moreover, millions of acres that are now too cold to grow crops will become warm enough. Furthermore, in traditional crop-growing areas, it is entirely possible that, with a shorter, warmer winter, farmers will be able to plant their crops earlier and harvest them later. What this means is that they might be able to get two crops planted and harvested in one year, effectively doubling the yield. The case can be made that rainfall will decrease in some areas of the world if global warming continues. But overall, worldwide precipitation will increase. So we might have to shift farming to other areas (which is not a bad idea anyway) but there will be plenty of places where rainfall is adequate for growing crops. And even where it isn't, there's always irrigation. Carbon dioxide is obvious.
Supposedly, it's the culprit behind global warming, so if global warming continues, it will be because of more carbon dioxide. But plants live on carbon dioxide - the more of it they have, the faster they grow and the higher yields they obtain. Greenhouse growers have artificially raised CO2 levels to several times current atmospheric levels, with no ill effects (and plenty of positive effects) to the crops. All in all, global warming will probably be the best thing to happen to agricultural production since the invention of the tractor and man-made fertilizers.
