There's a good chance that a nuclear exchange would result in a nuclear winter, and in the process drastically decrease the amount of arable land. In the worst

There's a good chance that a nuclear exchange would result in a nuclear winter, and in the process drastically decrease the amount of arable land. In the worst case, agriculture could become impossible entirely. You might say that the science on the nuclear winter effect isn't anywhere near settled... why take the chance? I like to have faith in humanity but this is a bit too much.