But over all, Australians shrugged off the warming seas killing the Great Barrier Reef and the extreme drought punishing farmers. On Saturday, in a result that stunned most analysts, they re-elected the conservative coalition that has long resisted plans to sharply cut down on carbon emissions and coal. What it could mean is that the world’s climate wars — already raging for years — are likely to intensify. Left-leaning candidates elsewhere, like Prime Minister Justin Trudeau of Canada, may learn to avoid making climate a campaign issue, while here in Australia, conservatives face more enraged opponents and a more divided public.