These people actually hurt the enviromentalist cause. Look here at this topic, just because of anger against these morons they are saying things against animals and environment.
The best way to reduce human population (more than 6 billion will make life hellish to everyone, it is already that for most of humanity) is giving good education to people and equal rights to women. Well educated people and integrated women have way less children and these children are not used as cheap labor in some Nike factory. There are no other way to test chemicals than animals, blame our tech level, but it is possible to make tests without cruelty.
All environment question can be solved with political lobby, education and peopple who use their brains. These stupid, f****** morons only make people think than anyone interested in living in a better planet is an idiot (some posts here prove that) like the al-qaeda make all muslims look like suicidal bombers. It's sad that many people have to suffer because of the idiocy of others. But, well, that's happens since the dawn of history...