Half-boar, half-pig hybrids that reproduce incredibly quickly are making their way south towards the Canada-U.S. border.

Oh shit oh fuck.

But on a more serious note, farms breeding huge amounts of animals that age fast and are super fertile is a huge environmental concern. When livestock escapes and hybridize with wild populations it will make a lot of areas barren.

Collapse is going to suck because its going to be a cascade of shitty capitalism-caused problems, not just one or two.