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Resources to tackle the world's problems are limited - so what should get the cash? Environmentalist Bjorn Lomborg, who ranks climate change as the lowest of global priorities, debates with Mark Lynas, campaigner for greater action to be taken.

Climate change is arguably one of the most important crises the world faces today. However, it competes for attention against other concerns such as disease, malnutrition and terrorism.

Deciding whether billions should be ploughed into sustainable development and tackling global warming, as opposed to controlling HIV, malaria or malnutrition, is an exceptionally difficult decision to make. Would you choose the same priorities as the scientists and policy makers? And will today's concerns still be big news in a decade's time, or will our attention have been diverted elsewhere?