With less than three weeks to go before the UN climate summit in New York, debate in the media is still stuck on the tired question of whether man-made climate change is happening or not. With a strong scientific consensus on that issue, it’s time to look at areas where things aren’t quite so sure.

Our authors Alice Bell and Leigh Phillips have summed up the state of play on the ten key issues that should be at the top of the climate agenda, and will continue to matter through 2015.