A manifesto from a London activist looks pretty scary, but is a great place to start a discussion.

The Intergovernmental Panel on Climate Change recently issued a special report on the impacts of global warming above 1.5°C above pre-industrial levels, and came to some dire conclusions about what will happen if we don't.

The key recommendations in the report include reducing carbon emissions by 45 percent by 2030 and reducing them to zero by 2050. I will repeat that: We have twelve years to cut carbon emissions almost in half.

This is doable. All it needs is what the report calls for – "rapid and far-reaching transitions in energy, land, urban and infrastructure (including transport and buildings), and industrial systems." Jim Skea, co-chair of the group on mitigation, is quoted in the Guardian: