If you're interested in a research-backed analysis of how much impact various solutions to global warming would have, http://www.drawdown.org/solutions-summary-

If you're interested in a research-backed analysis of how much impact various solutions to global warming would have, http://www.drawdown.org/solutions-summary-by-rank http://www.drawdown.org/solutions-summary-by-rank is a good reference. "Plant-Rich Diet" is #4 on the list.