The IPCC report’s warning

The latest draft edition of the UN’s Intergovernmental Panel on Climate Change (IPCC) bluntly warns that business-as-usual increases in greenhouse gas emissions will cause “further warming and long-lasting changes” in the earth’s the climate system, with increasing likelihood of “severe, pervasive and irreversible impacts for people and ecosystems.” Specific dangers include rising sea levels, more frequent extreme temperatures, flooding, drought, harm to marine life and violent conflicts among human societies in the wake of agricultural changes. Delays may have already cost the world society US$8 trillion.

So what can be done? As we argued in a

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