There are so many things, but future generations will be most concerned with the things affecting their lives at that time, and what were doing/not-doing now that will have the most long-term effect are 1) global warming, 2) ocean acidification, and 3) species extermination.

It will probably be remembered as the last generation to see the world with an ice cap on the arctic ocean, and will probably be vilified for all the signs having been there that the climate was about to break away into a vicious cycle of heating, but just couldn't get it together enough to do anything about it, because of the way it had decentralized control of the economy to the extent where it was impossible to reign in those economic forces invested in continuing to burn hydrocarbons at the unsustainable rate to which it had become accustomed.

It will be noted how ocean scientists were screaming as loud as they could that excess CO2 was not only making the atmosphere into a hothouse, but also how some of that surplus CO2 was being soaked up by the oceans and was reacting with salts in the oceans to form carbonic acid, which ate away at the shells of clams and oysters, and the structures of coral.

With loss of the coral, which formed the basic ecological foundation for all species of continental shelf species, vast extinctions of continental shelf fish occurred, to be replaced by enormous swarms of things that the fish used to prey upon, i.e., the oceans will seem to be taken over by trillions of jelly-fish, which are not very edible by humans, and so will be a factor in the famines that will affect those civilizations dependent upon the ocean for food.

And this will be remembered as the last generation to see large numbers of different species of plant and animals living in the wild. Pictures of diverse orchids and birds and animals will become coffee-table picture-book curiosities.

It will be blamed as an effect of a combination of how most people are very out-of-sight-out-of-mind, combined with how their Global Trade Speculator class - who didn't do any real work but who could make fortunes as middlemen by compelling populations to dig up or catch what was around them and ship it somewhere else - had bought influence in many important governments, such that even those who could see there was a problem and wanted things to be saved couldn't do anything about it because their governments had so surrendered their duties as leaders to the Global Trade Speculators because the Global Trade Speculators could make more money if there were no hands on the steering wheel, by speculating on people's panic as the economy swerved.

Plus it will be noted how with unfettered global trade minus authority and regulation, the average income of each individual was driven down to the point where even when individuals could see that the planet was being driven over a precipice, and even when they knew what needed to be done, still they couldn't do anything about it because their incomes had been driven down to bare-survival level, and so they didn't have enough spare time nor spare money to spend on trying to stop the catastrophe.

But, on the plus side... those in the future of the goth sort will note how the world was overpopulated with humans, but global warming and ocean acidification demolished the agricultural and fishing zones as people had known them, such that the planet went into a state of famine and war, thus cutting the human population back by billions.

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