Settled

According to the BBC:

The Earth's surface really is getting warmer, a new analysis by a US scientific group set up in the wake of the "Climategate" affair has concluded.
[...] Funding came from a number of sources, including charitable foundations maintained by the Koch brothers, the billionaire US industrialists, who have also donated large sums to organisations lobbying against acceptance of man-made global warming.
[...]Since the 1950s, the average temperature over land has increased by 1C, the group found.

Although there are caveats -- the work hasn't been peer reviewed, for example -- because its claims are not extraordinary, and corroborate previous studies, this suggests to me that this is copper bottomed science. Now, the scepticism about AGW -- whether this change is driven by humans or by sun spots -- will remain, but it has fewer boltholes to run into.
Whatever one's politics, one will have to take climate change into account, and responding to it will become the governing imperative of the century. Hopefully now no-one (especially a front rank politician) will be able to dispute climate change science with any credibility.