Insect lifecycles are highly dependent on what are referred to as "growing degree days". Climate change hasn't just made things hotter, it has made seasonal phases more volatile, meaning it's more possible for things like early emergence of insects to happen more often. As an example, imagine a very hot March, an insect emerges a few weeks early, then is killed off by an April freeze, which it would formerly have avoided. And, maybe it misses the chance to feed on the nectar of a special flower to which it is adapted for similar reasons. It may be warmer, but it isn't just "better for insects". The true picture is much more complicated.
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