By Arthur Neslen, Brussels

‘Negative emissions’ are needed globally by second half of century to stave off dangerous climate change, say UN scientists

The world must cut CO2 emissions to zero by 2070 at the latest to keep global warming below dangerous levels and prevent a global catastrophe, the UN warns.

By 2100, all greenhouse gas emissions – including methane, nitrous oxide and ozone, as well as CO2 – must fall to zero, the United Nationals Environment Programme (Unep) report says, or the world will face what Intergovernmental Panel on Climate Change scientists have described as “severe, widespread and irreversible” effects from climate change.

Via: http://www.theguardian.com/environment/2014/nov/19/co2-emissions-zero-by-2070-prevent-climate-disaster-un