Quote (sir_lance_bb @ Mar 31 2016 07:06pm)
People lowering their lifespans by 10-30 years is way more of a problem.
Meat eating isn't as big of an issue. As climate problems increase and all environmental problems become more of a problem, there will then be measures that will take place. The biggest contributor to global warming is mass transportation and the powering of homes and cities.
Meat eating isn't really unhealthy unilaterally. It might slightly increase your risks for some factors but nothing on a significant scale. Whereas overeating and absurd diets that lead to obesity is unilateraly unhealthy and you don't see obese people walking around at 80+ years old cause they died 10 years ago because they were too fat and their organs failed.
The depends on the literature that you read. Widely accepted is the FAO study by the United Nations back in 2006, which attributed animal agriculture as being responsible for 18% of greenhouse gas emissions. Later studies have gone on to disagree with the FAO study, but not in the sense that the FAO study is overstated, but is actually understated and the number is much higher than 18% when accounting for things like fuel use, fertilizer production and land change.
It's also more nuanced when we look the different types of emission based on sector. For instance, nitrous oxide has much higher warming effect than CO2, with the EPA stating that "The impact of 1 pound of N2O on warming the atmosphere is almost 300 times that of 1 pound of carbon dioxide". Additionally, the EPA includes this chart about the contributions of N2O based on sector:

It's also estimated, according to the EPA, that: "Going forward, N2O emissions are projected to increase by 5% between 2005 and 2020, driven largely by increases in emissions from agricultural activities".