Paris climate summit: Survey reveals 'greenwash' of corporate sponsors

COP21 advertisers criticised for lack of transparency, monitoring and emissions reduction as series of spoof adverts appear across Paris

A survey of 10 sponsors of the Paris climate summit has found that most do not publish data on their CO2 emissions, half don't track their lifetime carbon footprint, and only one is reducing its emissions in line with the EU's targets.

Full details of the summit's sponsorship deals will not be made public until after its close, although campaigners say that the a16.9m raised so far represents barely 10% of overall costs, and half of what was expected.