According to the article, there's a big fight over control of the Sierra Club board.
It's creating alliances between closet racists and eco-activists. Tom Watson, a founder of Greenpeace and a direct action eco-activist, has been siding with the platform, and he's justifying it with an apocalyptic vision of ecological collapse.
This brought to my mind some of the early issues of the earth first journal, where a number of the writers were clearly anti-immigrant, and more than a little bigoted. They reason that immigrants come here and become American (over)consumers. The solution would be to restrict immigration.
This vision of modernization is patronizing and racially prejudiced. In it's most extreme, it envisions people in other countries as indigenous persons living in low-tech idylls. It's the image of the "noble savage." This is completely at odds with the reality of expanding development, minimal environmental regulations in these countries, and high-tech global telecommunications.