"Humanity's evolutionary path has been a long littany of advances in how to modify the environment to better suit themselves. Tools, agriculture, medicine, culture-- they all converge on the unified objective."
First I'll point out that modifying the environment involves moving dirt and clearing areas of wildlife and vegetation to be replaced by agriculture and the construction of buildings, walls, and roads. It also includes pollution.
Making tools, in the sense of chipping rocks and whittling sticks, does not really modify the environment. Sustainably harvesting wild plants for medicinal or nutritional use does not modify the environment.
"Culture" is orthogonal; some cultures try to make nature fit themselves, some try to make themselves fit into nature.
Second, your idea that the entirety of humanity is unified across space and time in the singular objective of modifying the environment.to better suit themselves is preposterous. There have been countless cultures, and the most enduring ones have been those who, if they had an "objective", strived for exactly the opposite of what you claim.
That your culture is one of self-indulgence to the point of mass suicide does not make every culture thus. It's a mistake to project your cynical culture onto an entire species that sustained a stable population for tens of thousands of years.