Global warming is a huge threat to our earth, and gasses are the leading cause of it. Animal agriculture produces more greenhouse gases than cars and trucks in the entire world combined. Methane is a type of gas that is increasing the temperature of the earth and cows and sheep as livestock cause 37% of it. Also the water needed to produce a pound of beef equals 1,800 gallons of water, versus a loaf of bread requiring 240 gallons. As the world's population continues to grow this will become more and more