SUTHERLAND, Australia — Throughout Australia’s devastating fire season, one Facebook page has rallied an angry public like no other, with more shares and comments than anything coming from the prime minister or the country’s largest environmental groups.

That page belongs to Craig Kelly — a former furniture salesman who has spent a decade in Parliament setting himself up as the climate-change denier in chief.

Now, in Australia’s dark hour, Mr. Kelly has found his moment.

As the country fears it is being condemned to a fiery future by heat and drought, Mr. Kelly has been gathering and goading a right-wing tribe under the banner of posts that shout in all caps: “Bushfires have nothing to do with ‘climate change’” or “Beware of climate alarmists: Everything they tell you is a lie.”

Mr. Kelly, 56, insists that he is just trying to protect everyday Australians from higher energy prices and lost jobs in coal and other industries.