In 1977, current Barack Obama science advisor (some call him a "czar") John Holdren authored a book called "Ecoscience" with Paul and Anne Ehrlich. Shocking excerpts are here (via this). Per the penultimate link, in the book he proposed the following solutions to world overpopulation:

• Women could be forced to abort their pregnancies, whether they wanted to or not;
• The population at large could be sterilized by infertility drugs intentionally put into the nation's drinking water or in food;
• Single mothers and teen mothers should have their babies seized from them against their will and given away to other couples to raise;
• People who "contribute to social deterioration" (i.e. undesirables) "can be required by law to exercise reproductive responsibility" -- in other words, be compelled to have abortions or be sterilized.
• A transnational "Planetary Regime" should assume control of the global economy and also dictate the most intimate details of Americans' lives -- using an armed international police force.