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'Bottom-up' deal on climate change better?

National regulations and laws emerging across the world could be more effective than the 'top-down' UN-led talks struggling to reach a breakthrough in recent years.

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The US and China have announced a potentially landmark climate deal to cut greenhouse gas emissions. As imperfect as a global climate treaty based on national action might be, it probably represents the single most likely blueprint for success in 2015.

UNITED States President Barack Obama and Chinese President Xi Jinping announced on Tuesday a potentially landmark joint climate change deal. This has the potential to catalyse United Nations-led negotiations, which resume again on Dec 1 in Peru, to secure a new global climate treaty in 2015 to