A vegan diet could also conserve water. Hundreds of millions of people around the world do not have access to clean water. Animal agriculture wastes enormous amounts of it and is also one of the biggest polluters of fresh water. An individual eating a vegan diet can save an estimated 2000 litres of water a day and cutting down on just one kilo of beef saves 15,000 litres of water.
Industrial production of animals like pigs, chickens, and cows is the main source of freshwater pollution. Concentrated animal feeding operations pollute rivers, contaminate groundwater, and degrade lakes. According to the U.S. Environmental Protection Agency, “A farm with 2500 dairy cows produces the same amount of waste as a city of 411,000 people”.
Raising livestock costs a lot of energy. It takes a long time to raise animals; they consume a lot of food that was cultivated on land that could have been put to other use; meat products need to be shipped and refrigerated; and meat takes a long time to process from slaughterhouse to kitchen table. It is said that plant-based proteins can be raised with 8 times less energy costs than meat-based proteins.
Veganism could combat world hunger. It is estimated that 700 million tons of food that could be consumed by humans goes to livestock each year and that 82 percent of starving children live in countries where grain surpluses are fed to animals eaten by individuals in developed countries. Besides, all the deforestation, overfishing and pollution caused by meat and fish industries limit the overall capacity of the Earth to produce food. The global population is expected to hit or surpass 9.1 billion by 2050. There is not enough land on the planet to raise enough meat to feed everyone, nor can Earth deal with the pollution this would cause.