An interesting look at the Economic Impact Global Warming has. The costs of Global Warming are tremendous, estimates of course vary but most figures put out are in the trillions. So what does this mean for you and how are you directly affected by these costs? In 2007, scientists at the Carnegie Institution measured, over the past 20 years, the annual yields of the worlds six largest crops (which account for 55% of non-meat calories consumed by humans and 70% of total animal feed)and found that increasingly warmer temperatures led to lower crop yields.