E-mails hacked from a climate research institute suggest climate change does not have a human cause, according to Saudi Arabia’s lead climate negotiator. Mohammad Al-Sabban told BBC News that the issue will have a “huge impact” on next week’s UN climate summit, with countries unwilling to cut emissions. Scientists say the e-mails from the University of East Anglia do not alter the picture of man-made warming. Meanwhile, India has set a target for curbing the rise in its CO2 emissions.

Environment minister Jairam Ramesh pledged to cut India’s emissions intensity – the amount of greenhouse gases produced for every unit of GDP – by 20-25% by 2020.