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.
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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.
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.''
Queensland senator Barnaby Joyce said the whole debate about whether humans were causing the climate to change was ''indulgent and irrelevant''.
''It is an indulgent and irrelevant debate because, even if climate change turns out to exist one day, we will have absolutely no impact on it whatsoever … we really should have bigger fish to fry than this one,'' Senator Joyce said.
West Australian backbencher Dennis Jensen, who had read the recent scientific literature, said he interpreted the findings in different ways and believed climate scepticism within the Coalition was increasing.
''The scientific papers saying it is as bad as we thought, or worse, are talking about concentration of CO2 in the atmosphere - and concentrations are indeed increasing - but global temperatures have not gone up in a decade,'' he said.
''It's the impact of the increased concentrations of CO2 that is in dispute and I agree with [US professor] Richard Lindzen that it is more likely to be 0.4 degrees than 4 to 6 degrees … the doomsday prophesies do not stand up to reason.''
Mr Abbott now says he accepts ''we have only one planet and we should tread lightly upon it''.
Questioned about climate science last year, Mr Abbott said: ''I think that climate change is real, mankind does make a contribution and we should have strong and effective policies to deal with it. As far as I am concerned, the debate is not over climate change as such. The debate is over the best way of dealing with it.''
He has never repeated his 2009 comment that the ''settled'' science of climate change was ''absolute crap''.
His $10.2 billion ''Direct Action'' climate policy was deliberately crafted to straddle the deep divisions over climate science within his party.
To qualify for grants from the Coalition's proposed emissions reduction fund, a proposal must ''deliver additional practical environmental benefits'' as well as reducing carbon dioxide emissions.
Mr Jensen said it was this proviso that allowed him to back the Coalition plan.
''At least we will be doing things that make sense for other, practical reasons,'' he said.
Tasmania senator David Bushby said he remained a true ''sceptic''.
''I know eminent scientists have one view but I know other eminent scientists - usually ones who have retired and are no longer reliant on government grants - have a totally different view,'' he said.
