 This is from a site of the United States Department of Agriculture Maze, which is what's shown here is corn and We eat a lot of corn and a lot of animals eat a lot of corn Net photosynthesis is good This is turning sun's energy into something we can eat and so up here is eat and down here is Starve we don't eat if nothing is growing and this is temperature going from fairly warm to Really hot up here and in degrees Fahrenheit. There's a hundred right there And what you'll notice is for this particular one if you look at the rate of photosynthesis what grows As it's affected by leaf temperature when the leaf gets a hot Growth slows a lot This is something that's worrisome in the modern world a lot of places where we grow corn and other crops on the hottest day Of summer they don't grow very well because it's actually too hot for them and we face some Possibility that by late in the century the hottest summer that we've ever seen until recently will be considered cool and Given this trend that is something that a lot of people worry about