Lomborg proposes that the importance of global warming in terms of policy priority is low compared to other policy issues such as fighting poverty, disease and aiding poor countries, which has direct and more immediate impact both in terms of welfare and the environment. He therefore suggests that a global cost-benefit analysis be undertaken before deciding on future measures. The Copenhagen Consensus that Lomborg later organized concluded that combating global warming does have a benefit but its priority compared to other issues is "poor" (ranked 13th) and three projects addressing climate change (optimal carbon tax, the Kyoto protocol and value-at-risk carbon tax), are the least cost-efficient of its proposals.