Sayjo: it's worth watching. Just do it.

A couple things:

They claim a lot that every species is necessary and important to the biosphere. I really disagree. There are some instrumental species but there are others that would not really affect anything were they all killed. This is evidenced by the millions of species gone extinct recently, with only some change. If only one of those millions had gone extinct, do they really think life on earth would change so drastically? Species go extinct, that's just what happens.

Also, they talk a lot about preserving "equilibrium" and "stability." I think this is a fundamental assumption made by this film that may not be correct: that preserving the status quo is a good thing. The earth has changed drastically over the millenia. Does it make sense to fight the changes we see in our times? Possibly... but it is certainly not a foregone conclusion. Life would adapt to whatever things might happen.

They point out our dependence on oil and make it seem like if oil dried up, civilization would end. Even now we are racing to find substitutes for oil. Nuclear energy has already been found, and other alternatives are being developed. When oil runs out, we will be ready. If we are not ready, we will be forced to adapt, it's that simple.

Oh yeah and Dubai is falling on hard times nobody thinks of them as like the most amazing place in the world now, if they ever even did.

And this stat: Over 50% of the grain grown around the world is used for animal feed or biofuels.

That's not bad news at all. It means that right now without increasing capacity at all we could almost double the population.

What you say makes sense, changes happen. Species extinction is happening. What you, as a human, should consider is your survival, which is dependent on the survival of other species. Those species which have disappeared have changed the ecosystem. This is inevitable. That you do not feel this change as a person living in a city and consuming your consumer goods is another.
What this movie is trying to say is that you shall see the impact when it will be too late to reverse the situation.
You trust humanity will adapt, i think so too. The question is at what cost? Do you prefer to organise a global preventive project aiming at harmonising human activity with the ecosystem it depends on, or do you prefer to wait until the momentum when hunger, thirst, disease, flood, migrations, wars will annihilate 90 % of the world's population and allow the few that survived to adapt as they could? I prefer the first, i don't want to have to look at my child dying and saying: "sorry kiddo, i have no food for you."
And yes, if oils dry up and if no sufficient pre-emptive solutions have been deployed, civilisations will die. But the funny thing is that large cities and rich nations are much more vulnerable than the masais are. We call ourselves homo-sapiens but in reality the conditions for being that (e.g. the ability to make fire) are not even here. Most of the world is populated by babies. Most people have no clue how to make fire, soap, houses, grow food etc...
The future will tell anyway. If human kind indeed destroys it own environment, which would be the proof of their stupidity, their disappearance would be a good riddance anyway.