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Introduction: Last year marked a turning point in the debate on climate change. The scientific evidence continues to mount. The climate is changing, the effects are already being felt, and human activities are a principal cause.

In selecting climate change as the theme for this year’s World Health Day, WHO aims to turn the attention of policy-makers to some compelling evidence from the health sector. While the reality of climate change can no longer be doubted, the magnitude of consequences, and — most especially for health — can still be reduced. Consideration of the health impact of climate change can help political leaders move with appropriate urgency.