As we go into this week with all eyes on Paris for the big climate change conference, COP-21, we’re thinking about how the food we consume impacts the environment. You’ve read the statistics about how agricultural production uses 30 percent of the world’s energy and produces 22 percent of greenhouse gasses. Yet nearly every nation, when they get enough money, seems to want to consume more meat (see Carnivore’s Dilemma). And, then there’s the related health problems associated with eating too much animal fat.

To address this, back in 2003, a Madison Avenue marketer straight out of Mad Men named Sid Lerner and the Johns Hopkins Bloomberg School of Public Health started Meatless Monday, challenging people to go without meat for one day a week.

While