North American heat wave "virtually impossible" without human-caused climate change, report says
The intensity of the recent Pacific Northwest heat wave wasn't just unusual — it would have been "virtually impossible without human-caused climate change," according to a new study from the World Weather Attribution network. The study warns that "as warming continues, it will become a lot less rare." CBS News meteorologist and climate specialist Jeff Berardelli joins CBSN's Lana Zak with more.