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The article makes the following statement:
"...so if the entire U.S. population went vegan, we'd reduce our greenhouse gas emissions by only 6 percent."
If we're talking about a country that was responsible for one or two percent of worldwide greenhouse gas emissions, that might make sense. However, considering the US is responsible for about 25% of all greenhouse gases emitted worldwide, 6% of that seems like it would be a decent dent. Certainly, there's a lot more work to do, but it's all about the small steps you take that add up to a big impact. We could sit here all day and talk about things we could do and then shoot them down because it may not be enough. But if we do that, at the end we've done nothing, which is most definitely not enough.