I remember when I came home from elementary school one day, telling my dad (who is a fairly prominent astronomer) what I'd learned about global warming and helping the environment.
Par for the course, he tells me, "Dude, humans might very well kill each other off and take a whole lot of species with us. But don't think for a second that the Earth gives a flying fuck what we do."
That video was quite compelling, but even beyond that I still hold what my dad said to heart. I love nature, I'm a huge nature boy. I love snorkeling, camping, animals, the great outdoors and all that shit. Man's true place is in nature. We can pillage and rape nature and kill off millions of species per hour and it won't make a single goddamn fucking difference, and it's incredibly egocentric to think as much.
I would go so far as to say it's not only possible, but LIKELY that there have been several dominant species, like humans, with higher intelligence, that wiped out much of the planet's biodiversity and then ultimately themselves, several times over.
All of what we think we know about the Earth over the past 5 billion years are educated guesses. We naturally want to create and craft a story that is endlessly fascinating to consider, and there are thousands of scientist across the globe put to the task of figuring this shit out, but the truth is we just don't know. We assume that just because there's a fossil record, that we can assume what the world was like. But talk to any archaeologist and they will tell you; fossils are extremely rare and occur only under VERY specific and rare conditions. There is not a SINGLE complete human ancestor fossil. Not ONE. We only have the slightest hint at what our ancestors were like, and those fossils are quite recent in terms of earth's storyline. Whatever we THINK we know about the past is just the tiniest fragment.
Probably the most common fossil is that of the trilobite, which may as well have been the Prehistoric cockroach, capable of surviving damn near anything. We think we're so important and have such an influence on the earth? We, Homo sapien, have been around for 60,000 years. Trilobites were around for 300 MILLION years and it took a goddamn global extinction, probably from an asteroid, to end them.
We're incredibly unique, no doubt. But I don't believe for a second that we're the only higher-intelligence species that has existed on this planet. And I don't believe for a second that we are as nearly impactful as some think we are. We could wipe out every species on earth that exists today and that would still be a tiny fraction of every plant, animal, bacteria, and virus that has existed, ever. Our sun has another 5 billion years or so to go. Even if a nuclear war or another asteroid wiped out all life for a 5 million year period, there would be 1,000s of multi-million-year spans for intelligent life to abound once more.
Our reference point to time spans are the human lifetime; it's naturally how we gauge progress within the generations. In Earth-time this isn't even a heartbeat, it's not even a fart. We also take it for granted that there exists polar ice caps and deserts on Earth simultaneously; this is also, in cosmic terms, a rarity. In cosmic terms, we're enjoying an incredibly lush and temperate phase. But just as there are seasons on earth, there are seasons in the solar system, and any fluctuations in the Earth's or Sun's magnetic field could turn the entire earth into a sweltering, overbearingly humid, methane-ridden swamp, or conversely a giant block of ice.
Enjoy your time here gents, in cosmic terms we're in Spring break