It looks like you're new here. If you want to get involved, click one of these buttons!
On Tuesday I'm giving a talk at the SETI Institute. You can see my slides now:
Abstract. When pondering the number of extraterrestrial civilizations, it is worth noting that even after it got started, the success of life on Earth was not a foregone conclusion. We recount some thrilling episodes from the history of our planet, some well-documented but others merely theorized: our collision with the planet Theia, the oxygen catastrophe, the snowball Earth events, the Permian-Triassic mass extinction event, the asteroid that hit Chicxulub, and more, including the events we are causing now. All of these hold lessons for what may happen on other planets.
If you have any comments our questions, that'd be great!