The surprising way Mars affects our oceans

A study from the University of Sydney has revealed a surprising link between Mars and Earth. The gravitational interaction between the two planets drives a 2.4-million-year cycle of global warming - not the type humanity is currently causing via the emission of greenhouse gases - but a warming which affects the circulation of oceans. We're joined by one of the report's authors, Dietmar Müller, professor of geophysics at the University of Sydney.