The US government is going to grow milkweed to help monarch butterflies survive the effects of massive use of Roundup.

The use of pesticides is a form of habitat destruction, which (as usual) threatens a whole ecosystem, many species at once. Normally, protecting on threatened species is done by protecting the habitat, which protects all the species that live there.

This peculiar method of protecting monarch butterflies avoids protecting its habitat and thus avoids protecting the other species threatened by Roundup.