Insect numbers are in decline across the planet. Should we worry? Entomologist Marcus Byrne believes we should. Insects perform countless ecosystem services. These are little jobs in the background that are massively important for our survival and that of the rest of the planet. So, what is the cause of this loss of insects? Marcus suggests that we don’t know for sure. The reasons could be anything from our widespread use of pesticides to habitat loss due to human-driven development. His research points strongly to the global increase of CO2 in the atmosphere as the most probable reason for this decline. In other words, rising CO2 levels could well be causing an insect apocalypse. We must see these findings as another strong motivation to reduce our CO2 output and safeguard the tiny creatures that run our planet.