for several days in july of 2012, greenland surface ice cover melted more than at any time in 30 years of satellite observation. during that month, an estimated 97% of the ice sheet thawed.
for several days in july of 2012, greenland surface ice cover melted more than at any time in 30 years of satellite observation. during that month, an estimated 97% of the ice sheet thawed.
a speech on the floor of the u.s. senate