The fiercest battles for a climate deal are fought online
Using Twitter, Facebook and YouTube, campaigners are using the web to harness people power on a big scale
China takes first step towards climate deal by commiting to carbon target
Hu Jintao offers pledge to reduce rate at which emissions increase but fails to specify level or timescale
The real green new deal
The future is bright for the world's economies to go low-carbon – but only if we act together and support developing countries
