Greenland ice sheet may melt completely

The Greenland ice sheet appears more vulnerable to global warming than previously thought, and could disappear altogether if global temperatures rise more than 1.6 degrees Celcius above pre-industrial levels.

Mozilla orders certificate authorities to check their security

After the recent breach at web security certificate authority DigiNotar, and with fears that others have been compromised too, Mozilla has ordered certificate issuers to get their own house in order.