Carrying capacity refers to an enivornment's ability to sustain the life of X amount of Y species. If the species exceeded this capacity, there wouldn't be enough resources for them all and the population would collapse. In the context of climate change, people will sometimes claim that humanity is reaching/is already at/has exceeded the carrying capacity of Earth. Instead of questioning if we should change the way we use resources just a little bit, reactionaries will instead make the jump to not only concluding that this analysis is correct, but also that it justifies ecofascist policies towards the climate crisis which, regardless of their form, ultimately amount to genocide as a means to "depopulate" Earth as a """solution""" to the crisis.