When there is an impending threat of war, we get information from military experts. When there is an impending threat of volcanoes we get information from volcanologists. When there is an impending threats hurricanes, blizzards, floods, we listen to meteorologists. Threats from earthquakes, we hear from seismologists.
But here we we have a global threat of extinction (so the celebrities say), and we hear from...celebrities. 🙄