Some Paleontologists have discovered fossils of some infamous beetles (cockroaches) that were far bigger during the Jurassic period than they are today. Scientists aren't really sure why they were bigger back then (wasn't everything?), but it may have had to something to do with the warmer climate. Earth today has warm, tropical zones only around the equator, but during the Jurassic and Triassic periods temperatures around the globe were warmer. If it was the warm climate that contributed to the large size of the ancient species, we may be seeing larger species of beetles appearing as global warming continues. They may even be evolving as we speak.
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