6/6/2021: What Happened in Wuhan?, Ransomware, Sir David

On this week's "60 Minutes," a lack of transparency from Chinese officials and looming geopolitical consequences have damaged the credibility of a WHO-led inquiry into how the virus that causes COVID-19 originated. Lesley Stahl reports. How cybercriminals hold data hostage -- and why the best solution is often paying a ransom. Scott Pelley reports. And eighteen years after declining to take a hard stance in his first profile on 60 Minutes, Sir David Attenborough warns about the dangers of climate change.