VERIFY spoke to the scientist cited as the source of data in this graph, “R.B. Alley,” or Richard Alley, a glaciologist and climate scientist at Penn State University.

The UN’s Intergovernmental Panel on Climate Change produced a poster-sized graph for the launch of its climate change report in 2001.

VERIFY spoke to the scientist cited as the source of data in this graph, “R.B. Alley,” or Richard Alley, a glaciologist and climate scientist at Penn State University.