Some people think climate science is made up. This annoys other people. But calling each other dullards is unhelpful, and it misses the deeper questions. What determines who and what we trust, including science? And what can be done to make people and politics - particularly, Lord help us all, American politics - a bit less squabbly about it all? Joining Dave this episode is Laur Hesse Fisher, programme director for MIT's Environmental Solutions Initiative. Laur's an exper...