?Earth Hour was...advised by advertising giant Leo Burnet. Leo Burnet's chairman, Nigel Marsh, demonstrated his skill both in semantic perversion and moral obfuscation when he declared: 'I'm an optimist about climate change. The human race eventually abolished slavery and gave women the vote. We eventually work it out.' Get the implication? 'Deny' the dubious science or dangerous politics of anthropogenic climate change and you're the kind of person who would support slavery and keep women barefoot and pregnant in the kitchen!?