What is the single greatest threat to life on Earth? > life on earth. John Baillie Related postsWhat I did this summer!September 5, 2018Freedom of speech againMay 15, 2019Separation of PowersJanuary 8, 2019 Previous posthttps://www.theguardian.com/lifeandstyle/2015/jan/14/love-is-getting-answers-right-to-36-questionsNext postwar