People always talk about how prehistoric Earth was so dangerous due to animals and stuff, but I'd reckon it's way more dangerous due to to certain eras literally being impossible to live in due to environmental hazards and conditions. Like, at one point there was so much carbon that all the ice on Earth melted in the equivalent of a geological second.
Screw a dinosaur, bro you can NOT breathe in gas bro. Don't even get me started on the temperature stuff. At one point, I forgot which prehistoric era it was, the entirety of Earth was essentially one big desert with very little water because it reached temperatures of 130+ degrees Fahrenheit. You cannot survive that, idk what people are thinking. Like I'm ngl, I can MAYBE hide from dinosaurs for at least a day or two but I can't survive from extreme heat for even one day. My skin will be boiled off by the end of the week.