Dr Sherwood Rowland, who won a Nobel Prize for his studies of atmospheric ozone, said the consensus of scientific opinion on climate change was being ignored.
The greenhouse gases surveyed include not only carbon dioxide but also methane (CH4), nitrous oxide (N2O), ozone (O3), and fluoride-containing gases that contribute to climate change.
Understanding the role of snowflakes in catalysing the change from one sort of oxygen to the other should provide insights into how ozone is distributed in the atmosphere.
Talks are complicated by the fact that -- unlike the ozone layer, in which it was clear solar rays that got through cause cancer -- climate change's health effects are generally indirect.