With energy consumption and the environment becoming central concerns, Google has stepped into the frame to create a search engine front window that's a little bit greener - because it goes back to black.

Why black?

Well, when your screen is white - whether it's depicting an empty word processor page, or the Google search webpage, your computer consumes approximately 74 watts of power...

...but when screens are black the computer consumes just 59 watts of power.

This was first spotted by tech columnist Mark Ontkush, who wrote an article about the energy saving that would be achieved if Google had a black screen, taking into account the huge number of page views its search webpage enjoys.

Ontkush said that according to his calculations, 750 mega watts/hour per year would be saved if Google just went black to go green.

Google was listening.

In response to Ontkush's words, Google has created a black version of its search engine, called Blackle. It's functionally exactly the same as the white version , but with lower energt consumption.

You can use it here.

Now I guess it's time to apply pressures to other big online websites to move to fade to black on their webpages, because black is the new green.