As researchers find more uses for data, informed consent has become a source of confusion. Something has to change. (Correspondence)

Most people and nations now recognise the need to reduce greenhouse gas emissions to avoid dangerous climate change. However, there is a growing fear that this fragile support for action could be at risk because geoengineering - the large-scale manipulation of the environment to counteract climate change - is now receiving serious attention from scientists, policy-makers and the media.