Hadley says saudi officials argue that higher prices are driven more by uncertainty in the global market and the lack of refining capacity for the quality of oil most readily available .
Stephen hadley , us national security adviser , said the proposal demonstrated russian willingness to engage in " real co-operation " on missile defence .
Previous peer-reviewed studies-including one on the location of weather stations co-authored by mr watts-have suggested the mean surface temperatures provided by noaa , nasa and hadley cru are also not significantly affected by them .