This chapter discusses the extent in which insects are affected by global warming, but since it is hardly possible to fully disclose and examine the effects of global warming on insects, the most populous group in the world, in just one chapter or even a book, we have assumed here the task to provide a general overview of insects in relation to some current studies and approaches to insects in the context of global warming and climate change. We consider the level of these studies on an order basis, what are the general concerns and objects of study covered by these studies on global warming, and especially what are the responses of insects to global warming (particularly behavioural-migration one). Finally, we also envisage the scenarios that may occur under the effects of global warming.