Human Engineering and Climate Change [pdf]

tl;dr

1) Make people allergic to meat.

2) Give children hormone treatments to limit their growth (reducing metabolic needs).

3) Give people "cognition enhancing" drugs such as Ritalin to lower birthrates.

4) Give people pyschoactive substances such as oxytocin and SSRIs to increase the willingness to cooperate with social rules or goals.

They say this should be voluntary: "human engineering would be a voluntary activity – possibly supported by incentives such as tax breaks or sponsored health care – rather than a coerced, mandatory activity."