More than 2,000 climate scientists gathering in Copenhagen are expected to give a much clearer - and up-to-date - picture about the effects of climate change.
The scientists are concerned that the 2007 reports of the Intergovernmental Panel on Climate Change (IPCC) are already out of date. Latest data suggests greater rises in sea levels this century.
For the scientists, this conference is "about removing as much wriggle room as possible from the political negotiations on a new global climate treaty taking place in December".
In the context of the wrangle over the language used when talking about the effects of climate change, it will be interesting to see what conclusions a sober, research-based and non-political analysis will come to. The acid test will come when the politicians meet later in the year and what tactics they will employ to evade acting over what will undoubtedly be a pretty miserable prognosis.