New York Times environment reporter Andrew Revkin recently invited readers to post cost-effective environmental proposals on his blog, Dot Earth. He promised to send the 10 best ones, as determined by readers’ recommendations, to the Obama transition team on energy and the environment.

Intriguingly, two of the proposals focus on population. “In a world of increasing scarcity, if we do not get a handle on our own population, it will get a handle on us,” writes one reader. “Because of sustained exponential population growth, we are collectively destroying what remains of the natural world. We are also putting our species at grave risk for rapid catastrophic population decline. We cannot expect to sustain exponential population growth indefinitely,” warns another.

If you missed this opportunity to put in your $0.02 on environmental and population issues, don’t worry: You can submit your comments directly to the energy and environment policy team on the Obama transition website.

Yet another venue for influencing influential people is Thomas Friedman’s Chapter 18 Project. Friedman’s latest book, Hot, Flat, and Crowded: Why We Need a Green Revolution—And How It Can Renew America, consists of 17 chapters, but he has said that the second edition will include an additional chapter comprising readers’ best ideas on how to make the transition to clean energy, improve our global environmental stewardship, and revitalize America’s economy and international reputation by “going green.” You can submit your proposals on his website.