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Using a field experiment, we measured the heat tolerance of insects across many different groups. This is important because most previous studies either combine inconsistent datasets or focus on a single species. Our goal was to understand how entire insect communities respond to heat. We looked at a large variety of insects, such as flies, bees, beetles, butterflies and grasshoppers, to name just a few. We found that many are likely to face dangerous levels of heat stress. This was true even under conservative assumptions, including the possibility that species move into cooler habitats.