According to the Colorblind Web Page Filter, above is what Google.com looks like for users with protanopia (red/ green color blindness).

参照色盲网页过滤器，其看起来像是Google.com为红色盲（红绿色盲）服务的。

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Switch to the filter Results TAB, and click the green plus button to add a filter to your query.

切换至Filter Results标签，并点击绿色加号按钮，以向您的查询添加一个过滤器。

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The image below is a single 20-second exposure taken with a red-green-blue filter.

下图是用红-绿-蓝滤光片拍摄的单一20秒曝光照片。

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Philips' solution is to combine two blue and one red element, but use a green phosphor filter to convert one of the blue LEDs to green.

ENGADGET

In the northern English city of Sheffield, even bus shelters now sport green roofs to filter pollution.

BBC: Time to leave the comfort zone

The theory is that this green technology will filter down to passenger cars.

ECONOMIST: Sports compete to save the planet