Environmental groups like Greenpeace and Friends of the Earth would like to see a switch to renewable and clean sources of energy such as solar, wind and hydro-electric power.

BBC: Impact of global warming may be severe and wide-ranging

These types of reversal days give traders a cue to clean up some excess longs and to switch gears a bit.

FORBES: Gold And Silver Shine As Stocks Go Soft

Regardless of how much success Microsoft has in converting Gmail loyalists, though, a lot more people are about to become acquainted with Outlook's clean UI: the company has said it plans to switch Hotmail users over to the Outlook interface by summertime.

ENGADGET

You may be visually assaulted by Amazon branding at every turn once you switch the device on, but the exterior at least is reasonably clean.

ENGADGET: Amazon Kindle Fire HD review (7-inch)