alt Hacker NewsUltimately, the answer is fuel density. So, for long distance untethered travel, like planes. Beyond that, it's plastics production and chemical manufacturing.
We can switch to hydrogen for lots of stuff that requires carrying your fuel on your back, but some things get tougher because the density is just not the same as a hydrocarbon.
These are all surmountable (biodiesel, carbon capture->fuel cycles, bioreactors, etc), but they take time and money.
In the end, what will push us to get there are economic shocks. We're getting there, it's just painful.
Replies
In Australia the answer is political lobbying, without a doubt.
We had an emissions trading scheme[0] in 2012 meant to help in a transition to clean energy sources that was aggressively lobbied against by Australia's largest polluters and lasted only 2 years before being repealed by the incoming government by labeling it a "tax" that citizens would pay for. This led to a decade of policy stagnation[1] where we could've been transitioning away from fossil fuels.
So while energy density is definitely a factor, political lobbying is absolutely a factor.
[0] https://en.wikipedia.org/wiki/Carbon_Pollution_Reduction_Sch...
[1] https://www.ft.com/content/0a453f5c-e859-4300-9355-46822c451...
Fuel density wouldn't be such an impactful attribute if the US military and geopolitical situation and strategy were different.
Fuel density is logistically important and the US geographical position means that density is more important to the US than other nations. In other words, if we forecast that we'll be fighting foreign wars, fuel transport is an logistical problem that optimises for density.
Aviation is a few percent of global emissions. All aviation.
It’s probably the hardest thing to replace but if we can’t we will be okay.
Long haul trucking and shipping and remote site power are probably the next hardest things, and maybe coal for metallurgy, but these are also small compared to emissions from electricity generation and routine car transit. The big sources can be completely converted.
[dead]
No, that's fine, I get it that fossil fuels have incomparable density, but we're using them massively for stuff where density isn't that important. Anything inside a city, from transportation to homes to factories are already powered by electricity (or can be, e.g. cars), we're just inexplicably still using fossil fuels to create that electricity.
The US grid is still 57% coal and gas.