Now, thanks to environmental groups, retailers, and municipalities nationwide, doing the right thing is a lot easier.

现在，感谢环保团体，零售商和全国市民，做正确的事比较容易。

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Thanks to pressure from environmental activist groups, a 2007 law passed by the Democrat-controlled Congress and signed by Republican President George W. Bush will make the sale of standard incandescent 100-watt bulbs illegal effective January 1, 2012, 75-watt bulbs on Jan. 1, 2013, and 60- and 40-watt bulbs as of Jan. 1, 2014.

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Singer notes a number of possible explanations for why the other two groups might not have seen the behaviors initially reported, including compensation thanks to other genes, some unknown environmental factor, or variability in the knocked-out gene.

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