The extent of climate change if not its very existence is a hotly contested topic. Scientists though have little doubt that this is happening now, and that action is urgently required. Economists are definitely doing their part, since a changing climate is bound to have a huge impact on world economy. But the effort towards limiting the damage is also a cost, which governments are reluctant to bear as the benefit is so hard to measure. Hear podcast host David Wayne Callahan as he talks to Valentina Bosetti, professor of environmental and climate change economics at Bocconi, about the challenges we face and will be facing if too little is done.