"But that is utter bullshit, we have countless examples of human civilisations which have died off. Often we don't know what happened to them, but in general it is perfectly reasonable for our high-tech civilisation to take a massive hit."
Only once in history has human population been declining, and that was the period between 1348-1351.
Overall, at current technology and farmland, it is estimated that we could feed 9.5 Billion people comfortably. Any future innovation will only push up that number.
Again though, the main purpose of this video wasn't to debate if scarcity was real. It was to show that every year even though our oil consumption increases, our estimated proven oil reserves goes up by a far greater value, to the extent that today oil is less scarce then it has ever been in history, and as I said, anyone who understands basic supply and demand know that there is no such think as peak oil, or peak any other scarce resource, because due to the laws of supply and demand, the shifting of the supply line will be reflected in the price, causing an increase in the price and a decrease in the quantity demanded. In a free market we would switch to alternate forms of energy when the price becomes to high, and taken innovation into account, it is far more likely that the demand for oil will decline before the supply of oil.
Anyone who understands basic supply and demand knows that peak oil is a myth.
Now climate change is a different story, I think only a fool could argue that our climate isn't changing, but I am not convinced current proposals would do much to reduce global temperatures, I've given my opinion in the past on the relation to carbon emissions and global warming/climate change, and I think the idea that cutting emissions will have any effect on climate change is bullshit.