Dr Hoesung Lee is a professor in the economics of climate change, energy and sustainable development at Korea University in Seoul, South Korea. He has been the vice chair of the Intergovernmental Panel on Climate Change since 2008 and is running as a candidate to succeed Rajendra Pachauri as the new chair of the IPCC in October. Here, he discusses why setting a carbon price is "the most important work in climate change issues"... bit.ly/carbonbrief_hlee www.carbonbrief.org