…But Professor Trenberth believes too many researchers and too much ''second tier'' science are diluting the report's quality, and that science has jumped far ahead of the lumbering process. ''There are more people, it's more diffuse, it's harder to gain a consensus - quite frankly I find the whole process very depressing,'' he said. ''The science is solid, but with a larger group it's harder to reach a consensus, and updates every six years are just too slow. After the fifth assessment, we should push on with a different format.''
Two other scientists involved with the IPCC process, who asked to remain anonymous, told The Age the upcoming report contained many improvements on the previous edition, but that few ''breakthroughs'' would be included.