Their spin is that it's only 10% due to the sun, and 90% due to human activity.
Notice the 10-30% estimate is based on direct solar heating. The actual solar effect will include any increased greenhouse effect from melting methane-hydrates or thawing peat-bogs, which can account for an increase
in greenhouse gasses several orders of magnitude greater than human activity.
All this makes the fact of global warming more certain, and the fact that it is not caused by human activity more certain.
The leftist-environmentalist response is exactly the wrong one: if major climate changes are up ahead, we want as fully developed and vibrant an industrial base with which to deal with them as we can get. (And maybe we shouldn't have done such a good job of cleaning up particulate pollution. A bit of soot in the air might actually be good!)
Mostly Bush.