This news has us buggin’: Historical warm periods have been linked with an explosion of insect activity, and not-so-distant future warm periods may very well see the same, says new research published in the Proceedings of the National Academy of Sciences. Not only that, but elevated carbon dioxide levels may cause plants to produce fewer nutrients, so insects must gobble more foliage to mitigate their hunger — bad news for humans who wanted to eat those bug-devoured crops. Now where did we put our insect repellent?