Billionaire Tom Steyer tells fellow 2020 presidential candidates to fly commercial like him to help the environment

Flying commercial is nothing new for billionaire Democratic presidential candidate Tom Steyer, as he's even been known to fly economy. The self-made hedge fund billionaire says climate change is his 'No. 1 priority' and he encourages his fellow presidential hopefuls to 'walk the walk' when it comes to reducing their environmental footprints.