Are cows polluting the earth?

Who would have thought that so much pollution can come from farming beef for the traditional American burger industry. This video shows the extent of the damage that farming cows and the production of burgers is having on our precious environment. See what the hidden cost of burgers is below. http://www.youtube.com/watch?feature=player_embedded&v=ut3URdEzlKQ#t=259 So, are cows polluting the earth? What can we do to stop it? The UK government take this issue very seriously but are they doing enough. They have guidlines here for farmers but are they being followed. https://www.gov.uk/reducing-air-pollution-on-farms