(Image: Andrzej Krauze)
CRUCIAL climate talks in Paris are fast approaching, hailed as the last chance for a deal to avert dangerous warming. The good news is that the talks are already a success, in the sense that national pledges on emission reductions would change our current worst-case trajectory – we’d go from expecting a 4 °C increase by 2100 to .
The bad news is that the pledges won’t avoid 2 °C of warming, the point where dangerous climate shifts loom large. Existing greenhouse gas concentrations
