The Warner-Lieberman bill on climate change – a piece of legislation which was recently abandoned in the US Senate but is seen as a precursor of future policy – would have postponed the temperature increase in 2050 by about two years. Recently, the Copenhagen Consensus project gathered eight of the world’s top economists – including five Nobel laureates – to examine research on the best ways to tackle 10 global challenges: air pollution, conflict, disease, global warming, hunger and malnutrition, lack of education, gender inequity, lack of water and sanitation, terrorism, and trade barriers.