To save the Earth: Eat Less meat
"The quest for ever cheaper meat in the past few decades – most people even in rich countries ate significantly less meat one and two generations ago – has resulted in a massive expansion of intensively farmed livestock. This has diverted vast quantities of grain from human to animal consumption, requiring intensive use of fertilisers, pesticides and herbicides and, according to the Unep report, "caused a web of water and air pollution that is damaging human health". The run-off from these chemicals is creating dead zones in the seas, causing toxic algal blooms and killing fish, while some are threatening bees, amphibians and sensitive ecosystems. "The attention this meat scare has drawn [highlights] poor quality meat. It shows society must think about livestock and food choices much more, for the environment and health," said Sutton."
http://www.guardian.co.uk/environment/2013/feb/18/halve-meat-consumption-scientists