US president says every nation has a responsibility to do its part and ?overcome old divides, look squarely at the science and reach a strong global climate agreement next year? Barack Obama has stared down both Republican hostility at home and the reluctance of his Australian G20 hosts to insist that the world can clinch a new climate change deal next year. The president used a speech on the sidelines of the G20 in Brisbane, Australia, to confirm what was revealed by the Guardian on Friday: that the US would be contributing $3bn to the Green Climate Fund that aims to help developing nations cope with the effects of global warming. And he insisted nowhere had more to lose from rising temperatures than the Asia Pacific region and Australia in particular.

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