Pen Hadow calls for Arctic Sea Ice Value

The ecosystem services provided by the Arctic sea ice urgently need to be given an economic value too, says polar explorer and Geo Mission CEO Pen Hadow.

[What was the value of the mile-thick ice that formerly covered the Chicago area?]

When the glacier reached its southernmost limit about 20,000 years ago, the ice was a mile thick at Chicago--an enormous weight that depressed the land beneath.