Let’s all step back and take a look the whole (thread-, not world-) picture here:
Chen019 is a white American and is well known in GD as our resident “racial realist.” Race and heredity are everything to him. Most if not of all of his GD threads relate to this one way or another. While he rarely states so plainly, there is no question that he finds the current immigration pressure to the U.S. objectionable, in substantial part, because most of the immigrants and would-be immigrants, now, are nonwhite – not just the products of non-“Western” or Third-World cultures, but nonwhite genetically.
Chen is not alone. There are a lot of Americans who want border control for similar reasons. Usually they are aware that their reasons are relevant only to a minority of white Americans nowadays, so if they want to preach to nonconverts they have to find other grounds. John Tanton is one of them and, for decades now, a leader of them. (Not necessarily the most famous of them – that probably would be Pat Buchanan.)
I don’t believe even Chen would contradict one word of the above. (Sputtering is not contradiction. Every thing I have yet seen from Chen when pressed on such points amounts either to a sputtering or a “Yeah, so?!”.)
Chen019 starts this GD thread calling (American) environmentalists “cowards” for not taking a solid line for immigration control. He blames this on their being torn “between their concern for the environment and being accused of prejudice, but surely they can make their case on a colorblind basis?”
Note the unstated assumptions:
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All or nearly all American environmentalists really feel exactly the same way Chen does – that (a) slowing the growth-rate of the American population (as distinct from the global population) is a top-level environmental priority, and (b) the necessity of U.S. immigration control as an element of U.S. population control is too obvious to be questioned.
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They are not actually concerned, here, with not being racist, only with not being perceived as racist.
Now, I haven’t been actively involved with environmentalism for a long time, but I’m fairly certain that 1 is utterly flat wrong, including all subparts; and nothing in either thread yet suggests a contrary conclusion. As for 2, can you say “projection,” kids?
A bit further into the thread Chen, or maybe it was magellan01 (longass thread, now) adds another element of blame: “Rich donors” are gagging any immigration-control debate within the American environmentalists community. Now, I think we all know that the kind of “rich donors” most likely to use their money to block immigration reform are the kind whose businesses hire illegals, and who would as soon cut a check to the Communist Party as the Sierra Club. But Chen & Co. quite curiously make no mention of this, that I can recall, instead focusing on rich ideological dogooders of the Sorosian type – in this case one David Gelbaum, who, back in 1994-95, threatened to stop donating if the Sierra Club came out against immigration. (The club’s decision to remain neutral came in 1996.) Now, generally speaking, down that path – the idea that self-described progressives, etc., are really the dupes and puppets of moneyed-and-powered interests with similar but far more sinister agendas – lies madness most Horowitzian. (And then RaleighRally points out that Gelbaum is Jewish and Jews are pro-immigration even WRT Muslims because a “multicultural environment” makes them feel safer from possible persecution and, well, never mind all that, not Chen’s thing that I know of.)
Well, so far, so Chen.
But then GIGObuster starts this Pit thread saying to Chen, in effect, "You and magellan and even Tanton are the dupes, you useful idiot! You nativist assholes are being used and manipulated by moneyed-and-powered parties even more sinister – the ones who want to block or at least divert attention from any real discussion of global warming!" (Or however GIGO might put it; I’m having fun here but I’m sure I’m not strawmanning.)
Wow.
Just wow.
Now, don’t get me wrong, I find that thesis entirely plausible as stated. But, dude, can you see how, to a newbie observer, this whole thing might make you look just exactly like Chen’s LW opposite number? 
It’s material for its own GD thread anyway, if you’ve got any real follow-the-money cites.