A few days ago, former Vice President Al Gore unleashed an expletive-filled tirade against those he accuses of denying the impending damage triggered by human-caused climate change. So why is Gore lashing out like this? What does the empirical data actually show? And if climate change advocates actually got their wish on higher taxes and emission restrictions, what do they hope would be the result in 40 years? We discuss it all with geologist, author and climate expert Leighton Steward.