I loves me some NdGT but beyond the fact that if it wouldn’t have been Columbus, it would have been someone else soon enough, I would think maybe agriculture has it beat.
What do you think is the most significant thing to happen in our species?
The contact between Europe and the Western Hemisphere was pretty important, no matter who did it. Other Europeans discovered America before Columbus, but when Columbus discovered it, it stayed discovered.
I’ll take “Genetic bottleneck” for $200 please, Alex. That’s the winner. Nothing else matters if we got that wrong.
The permanent discovery of the Americas and the ensuing trade & warfare was probably number 2. 600 years later we’re still working now in 2023 to level-up all the landmasses and all the people. But there’s no significant undiscovered land or civilization left; we know who / what / where everyone is.
Space travel may eventually dwarf finding the Americas, but not until we meet our first aliens out there and survive that civilizational encounter. Or plant a successful fresh civilization on some other “Class M” planet. Meantime it’s the equivalent of proto-apes wading into a pond hoping to capture some crayfish for dinner. Except we’re not smart or dexterous enough to catch anything yet; we’re just wading, groping, and stumbling, not catching the speedy crayfish.
Or possibly stopped the countdown.
What happens when CO2 is below 150 ppm?
Below 150 ppm, plant-life dies off on a massive scale. The Earth actually came very close to that point many times over the last 2 million years during the ice ages. At the bottom of the last ice age just 20,000 years ago, life on the planet literally teetered on the brink when CO2 fell to a level of just 180 ppm.
It’s too soon to tell for some things. For example, our breaking free from the confines of our planet will be deemed supremely important to our species only if we survive and continue to be a space-faring civilization. Otherwise, space exploration will be deemed only as something cool, but insignificant humans achieved at the twilight of our existence. “Yeah, they gathered a few extraterrestrial rocks and took some pretty space pictures, then ‘poof’— global warming snuffed them out.”
If we do survive as a species, I believe the most significant event that humans have achieved, even more-so than space exploration, is AI. AI will transform humanity in a profound way, though it’s hard to envision the degree it will do so since we are just at its birth. AI is a newborn baby that will grow into a mature adult that may become humanity’s savior (it will solve existential problems like climate change with ease)…or our destroyer (it could conclude that we climate-changing morons are more trouble than we’re worth and simply get rid of us).