The project was presented to the public at the British Science Festival in Bradford, 13 September 2011 to coincide with plans to conduct the 1 km delivery system testbed in Norfolk the following month [REF].
Following the original announcement, a campaign opposing geoengineering led by the ETC Group drafted an open letter calling for the project to be suspended until international agreement is reached,[REF] specifically pointing to the upcoming convention of parties to the Convention on Biological Diversity in 2012 [REF].