President Obama
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Obama: Climate change is 'greatest threat'

3 August 2015 Last updated at 20:40 BST

US President Barack Obama has unveiled his Clean Power Plan - his strategy to cut greenhouse gas emissions from US power stations by nearly a third by 2030.

Outlining the details, Mr Obama said that "no challenge poses a greater threat to our future and future generations than a change in climate".

The president warned that this was "the first generation to feel the impact of climate change and the last generation that can do something about it."