The thing that puzzles me is that nobody is talking about oxygen.. Remeber oxygen ? It's the stuff we all breath.
Everything we burn uses Oxygen, jet engines, motor cars, fossil fuels (even the humble peat), heating oil etc. and, it's not an endless supply. Consumption is, mostly, a 1 way street and we can't get it back easily because it forms strong chemical bonds.
Just about every living creature on the planet depends on it.
Big question is;
are we all going to drown, or gasp and choke our way to death through oxygen depletion ?