THE most prominent political climate sceptics see no reason to change their minds, despite the welter of studies over the past fortnight showing forecasts of global warming were correct or underestimates.

Many of the climate sceptics, influential in elevating Tony Abbott to Coalition leader, say they see nothing to convince them that human activity is causing the climate to change.

Tony Abbott ... says he accepts "we only have one planet and we should tread lightly upon it." Credit:Glenn Hunt

The Global Carbon Project has released forecasts that the planet could warm by between 4 degrees and 6 degrees by the end of the century and Nature Climate Change on Monday published a study finding that warming is consistent with 1990 scientific forecasts.

South Australian senator Cory Bernardi, formerly Mr Abbott's parliamentary secretary, said: ''I do not think human activity causes climate change and I haven't seen anything that changes my view. I remain very sceptical about the alarmists' claims.''