The prime minister, Gordon Brown, will tomorrow host a high-level political conference aimed at tackling global issues such as climate change and poverty in the developing world. Brown will be joined by 15 world leaders and more than 300 international policymakers, academics and experts for the Progressive Governance conference in London.The group, which includes foreign secretary David Miliband, the South African president Thabo Mbeki, his Australian counterpart Kevin Rudd and New Zealand's prime minister Helen Clark, will be focusing on finding ways of addressing the global challenges posed by climate change, poverty and international development, the reform of international institutions and economic and social reform.Speaking in an exclusive video on guardian.co.uk, the prime minister said that the international nature of the problems meant that they could not be solved by countries in...

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