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Climate change was on the tip of the tongues of many of the Democratic presidential candidates during their first debate Tuesday night.

Four of the five candidates on the stage Tuesday mentioned climate change as a major campaign issue unprompted, with only former Virginia Sen. Jim Webb declining to do so. Webb later gave his support for an "all of the above" energy strategy that involves fossil fuels and renewable energy.

Some candidates attacked the issue harder than others, particularly Vermont Sen. Bernie Sanders and former Maryland Gov. Martin O'Malley.

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