So almost half of Party members, if our survey is right, are in line with the party political consensus – that human activity is driving global warming.

Roughly a third believe that global warming is happening, but not that human activity is driving it. They presumably place greater stress on the role of “natural forces such as the sun, cosmic rays, clouds and the oceans”, to quote Andrew Turnbull.
And one in ten think that global warming isn’t happening at all.