Protein Overload?

Today I read this article about how much protein humans really need.  This is the article if you want to read it.  Basically it says that humans don't really need that much protein, yet we eat a lot of protein everyday.  The article also says that eating a ton of meat is bad for the environment because it takes enormous amounts of pesticides, fuel, chemical fertilizers and also there is increase in greenhouse gases from meat and dairy production.  I never knew eating meat harmed the environment.  I've never cared much for the environment, but maybe its about time I did.  I also feel like challenging myself for a bit.  The article suggests eating one less hamburger per week, eating other protein sources such as beans, low-fat yogurt, etc, buying higher grades of meat/dairy and not wasting meat.  My challenge to myself will be... not eating meat every other day.  This will be stupidly challenging because I eat ridiculous amounts of meat...  I ate beef today so tomorrow I will start my journey in helping the environment and challenging myself.  Wish me luck and maybe I'll ask some of my friends to join as well.