It's just lighthearted shorthand for "global" issues as opposed to the local problems that a ULEZ is intended to solve. The planet has not survived changes of this magnitude happening so quickly - it's time that allows the planet to adapt. And a big difference is that we now have huge cities in coastal regions, that would have been swamped by past sea level changes.
Who mentioned "juvenile prattle"?
A journey of a thousand miles begins with a single step. How do you propose to persuade China to make changes if richer countries don't set an example?
As I calculated up-thread, if you take the current UK mileage apply the electrical efficiency of current electric vehicles, and assume they're charged overnight 10pm-6am, it would need 8 hours of 54GW. Current UK capacity is over 75GW. Yes more investment is needed, but it's doable - for instance current planning is for another 40GW just of onshore wind by 2030. The issue is more about local grid capacity, but National Grid seem to be relatively relaxed that it's doable - it's not long ago that everyone was worrying about how the grid would possibly cope with >20% renewables. Electricity is still far cheaper than petrol - as I keep mentioning, a family member was paying £200/month on petrol, and then leased an old-shape Leaf for £200/month plus buttons on leccy. But one of the things signalled in recent announcements is that the costs of subsidising new technology are going to move from electricity to gas.
And you assume that "business as usual" is going to be easy. Oil discoveries peaked in the 1960s and have been declining since then - where will the oil possibly come from to power petrol/diesel cars into the 2040s? You worry about the economics of change without thinking about the current course we're on - does it make more sense to generate energy in the UK or to give trillions of dollars to Russia and the Arabs?
Anyway, apologies to others on this thread, this is all getting rather off-topic for a thread about cars.