'The world is in trouble,' so Sir David Attenborough has joined Instagram

4:00am PDT - September 24th, 2020    david attenborough - Mashable

Now you can follow another one of your faves: Sir David Attenborough has joined Instagram.  In his debut video on the app, the 94-year-old natural historian and broadcaster said he's joined because "saving our planet is now a communications challenge. We know…