This is an incredibly blasé, overconfident, full of hubris, and lacking historical awareness and insight into human nature, comment.
@Hegemon is entirely right to warn that we are not so superior as to imagine ourselves immune to the same danger of collapse that countless civilisations before us have been through. If history teaches us anything, it is that it would be naive to imagine that things will continue forever as they are now. That's simply not in the nature of things. There is nothing inevitable about human progress, and
@Hegemon was also right to point to over-exploitation of resources and the evolution of disease as major danger points that could easily throw us back into the dark ages.
I'm not sure it's even worth debating this. I refuse to believe you are unaware of the overwhelming evidence of the unsustainability of man's exploitation of the planet. Either you have been living in a cave for the last 40 years with no contact with the outside world, or you are deliberately ignoring the evidence for political-ideological reasons.
Some analysts argue that we have already passed peak oil. The history of civilisation has been powered by increases in the efficiency with which we extract energy. That ratio is now in decline, and there is no viable alternative to cheap oil that comes anywhere close to meeting present and future energy needs. I still have hope that alternatives will be developed, but we may not have time in any case.
80% of the increase in food production since the industrial revolution was powered by oil. It follows that the demise of oil will reduce global food supply by 80%, if no action is taken to find an alternative. Even in the best case scenario, with global population set to reach 9 or even 12 billion, it doesn't take a genius to see that we could be headed for mass starvation.
Add to that the fact that global warming is destroying the viability of agriculture across some of the most densely inhabited areas of the globe, notably India and China due to melting of the Himalayas which means both countries' rivers are drying up, an increasingly unstable and uninhabitable Middle East where temperatures are soaring (and there is evidence the war in Syria was caused by climate change), plus regions like the Nile becoming a hotbed of future conflict over water, and you've got a recipe for disaster.
I'm not saying we are necessarily doomed, at least in the short run, but I certainly am saying you can afford to be a lot less blasé about the challenges facing global civilisation in the years ahead.