I am surprised the US global warming types have not seized on immigration, legal and illegal. With 1.2 million legal immigrants entering annually and another 500,000 to 1 million legals per year, the US population is soaring faster than any developed nation on the planet with an annual population growth of .89%. We have added 100 million since 1970 and will add another 167 million by 2060. In fact, in just 23 years, we will add another 62 million [roughly the size of the UK], by 2030. And just imagine the carbon foot print an America of half a billion people will present.
They're not too happy about the illegals leaving their trash all over the land they cross.