But this time, instead of being explicitly linked to theories like eugenics and social Darwinism, it was propelled by the emerging ideology of environmentalism.

但这次的公众讨论不再与优生学或社会达尔文主义有关，推动这些讨论的是新兴的环保主义理念。

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Whenever biology meets behaviour the spectre of social Darwinism and eugenics looms menacingly in the background.

无论何时用生物学解释行为，社会达尔文主义和优生学的幽灵就会在这种背景下浮出水面。

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In the early twentieth century, Malthusian ideas on population control were linked to theories of eugenics and social Darwinism.

在二十世纪早期，马尔萨斯对于人口控制的想法还与优生学和社会达尔文主义有关。

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The Obama re-election campaign began April 3, with the president's now-famous "Social Darwinism" speech at the Associated Press luncheon in Washington.

WSJ: Henninger: It's 1936 All Over Again