We're going to burn and it's all our fault:

Is not exactly what the IPCC are saying. However, in their own wishy-washy way, they're saying that we can be 90% certain that we're to blame for global warming and it could have irreversible consequences if we continue to ignore it.

If you look at the overall picture of impacts, both those occurring now and those projected for the future, they appear to be both larger and appearing earlier than we thought [in our 2001 report].
Some of the changes that we previously projected for around 2020 or 2030 are occurring now, such as the Arctic melt and shifts in the locations of various species.
-- Martin Parry, IPCC

The UN are calling for world leaders to do something about it.

... and maybe, just maybe, the UK might be about to take serious action.