Nasa scientist: climate change is a moral issue on a par with slavery

This page last updated on 04/08/12

Prof Jim Hansen to use lecture at Edinburgh International Science Festival to call for worldwide tax on all carbon emissions.

Prof Jim Hansen: 'We’re handing future generations a climate system which is potentially out of their control'. Photograph: Melanie Patterson/AP

Averting the worst consequences of human-induced climate change is a "great moral issue" on a par with slavery, according to the leading Nasa climate scientist Prof Jim Hansen.

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