Well that was an interesting post, however it doesn't address the issue that the meat industry is one of the most devastating industries from an environmental standpoint. There have actually been studies showing that reducing meat consumption would be beneficial for the environment (1). And you don't have to be a "pure" vegetarian do do this, simply reducing your meat intake already helps!
it doesn't need to address the issue because plant eaters contribute as much as meat eaters. they just do it in a different way. I reference in the article.