Climate activists point to Dr. James Hansen as claiming there is a tipping point where so much CO2 has been put into the atmosphere from the burning of fossil fuels that the climate will rise uncontrollably. There will be a runaway greenhouse gas effect! Much like what happened to Venus. As we will find out in this episode, this isn't what he said. This sort of thing where Earth's atmosphere would grow in thickness by 130 miles and the Earth's surface would reach 850 deg F is highly unlikely. Hansen states this would require a highly unusual set of circumstances that if they could arise would be in a time frame of billions of years! So we have 9 years left before the climate apocalypse? The oceans will boil away Mr. Al Gore? Are these scientific claims or just rhetorical arguments? Does it make sense that Earth could wind up like Venus from ...