eat fewer meat and dairy products, you can reduce greenhouse gas output? 
How can eating habits slow warming?Animals like cows produce a lot of methane (they belch and fart a lot of this gas!). Meat production also means more forests burned for ranching and growing more cattle feed. And many of these foods get flown in from other countries which means lots of 'food miles' and CO2 pollution. What's more, a typical American diet makes 1.5 tonnes more greenhouse gases each year (per person) than that same person eating a pure vegetarian diet (vegan). That's more than you'd save by swapping a standard car for an economical hybrid car.
Waste food = more greenhouse gas!