Mine, in cardio-respiratory arrest. The rest of y’all can do whatever you want.
Or both.
I plan to watch it from my table in the Restaurant at the End of the Universe. 
Sounds like a vigorous S&M date.
Looking ahead even further, basically all matter in the universe will eventually collapse into a massive black hole. The subatomic particles will evaporate and generate another big bang, starting the entire process over again. Mind blown!
Define the terms “world” and “end”,
In fire.
“This is how the world ends: Not with a bang, but a whimsy.”
– Dust jacket of one edition of Cat’s Cradle by Vonnegut, circa 1970
The turtle gets a case of the hiccups, one of the elephants gets bucked off, and we go spinning off into the void like a giant space frisbee.
The ADORABLE Master Race, I think you mean…
The world will end as soon as 144,000 male Jewish virgins complete their Bible studies classes.
So we are actually helping prolong the life of multi-cellular organisms by stocking up on CO2?
You’ve been waiting twelve years for this thread to come up, haven’t you? 
Well played.
The BIG GNAB
Try EXIT MUNDi, a collection of end of the world scenarios.
World? Do you mean the earth, all life on earth, or human life on earth? they are not the same thing.
realistically, I think humans will transcend biology and become a species of machine intelligence. That’ll spell the end of human life just because we moved past it. Beyond that, I don’t know.
By Technological Singularity. The Old Testament has very much information on the subject.
You should ask science writers for possible scenarios.
As others have said, there’s a difference between a) end of human life, b) end of all life and c) total destruction of the planet.
If we’re talking about the latter, then it would either end by being swallowed up by the sun, or perhaps because of malign actions by a vastly superior alien civilisation. Anyone checked the planning office on Alpha Centauri recently?
Aliens my butt.
The planet will be destroyed by some xkcd-inspired experiment gone wrong: Laser Pointer (one shining example among many)
It will end with the same speed and intensity it has started: when resources are exhausted and life is no longer sustainable. After that, everything that’s left of us will be blown away over thousands and millions of years until the planet becomes a barren rock flying within or without orbit, and one day some other civilization will find us across the universe and give us a unique name such as “PW2-00002”. They can hardly wait to probe our world for a potential form of life, and it will make headlines across their globe when that probe finally makes it, and the last image it will broadcast back to their world before the battery dies is one in which there is a plastic bag bearing the words Spinneys, which - back on DX1-00001 - they’ll find quite strange, and they’ll probably end up writing poetry and singing songs entitled Spinneys.
That’s how.
Rather than generating CO2 right away, it would be better to not burn it at all since then it would be in the non-volatile ground. However, according to a Wikipedia cite I can’t find right now, we may be heading toward another Ice Age in the short-term geological future (as opposed to the fake “global cooling” scare that didn’t exist in the 70s), so we might also want to stockpile CO2-generating stuff for our descendants tens of thousands of years in the future to stave that off for a few centuries or millennia.