"There's no way that you put greenhouse gases into the atmosphere and it won't warm and the ice won't melt," she said before setting out on her snowmobile expedition. "The uncertainty is when."
On endless ice, searching for clues to our future →
"As a physicist, putting CO2 into the air is good enough for me. It's the physics that convinces me," said veteran Cambridge University researcher Liz Morris.
The American `allergy' to global warming: Why? →