Twice in recent times the Liberals have faced an existential crisis over climate and energy policy: in 2009 over Kevin Rudd's Carbon Pollution Reduction Scheme, and in 2018 over the National Energy Guarantee, a plan to reduce emissions while maintaining reliability at lowest cost.

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In each case the party was led by Malcolm Turnbull, first as opposition leader and then as prime minister. Both times, Turnbull suffered a mortal blow to his leadership.

Looking back to the 2018 crisis, the now leader Sussan Ley told the ABC's Nemesis program after

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