@Stooshie8 I take your point on the pensions, although just because it's legal doesn't make it right. And if oil hadn't been discovered in the US, off the coast of Scotland, and under the desert, we'd have had to find alternatives. I don't really think nuclear is the answer, either, for many many reasons.
I belong to one of those generations that's fairly likely to drop dead in harness, as it were, so to be truthful I'm not anticipating seeing much of my pension. If I do manage to claim any of it I'm expecting I'll have to do some kind of work alongside it if I want to live.
The transition from a capitalist society trading bits of tin and paper and little electronic flashes on a computer screen is the main reason I think it's going to get very unpleasant for several decades in the not-too-distant future. Although so much work is pretty pointless anyway, especially a lot of office-based work, that it would be nice to think it could be replaced by something a bit more meaningful. Agriculture, teaching, healing, creative endeavours... I'm not overly hopeful on that, though, since we've all been sold a Dream of Things paid for by the exchange mechanism of aforesaid bits of tin, paper and computer pulses for so many years. Metal and paper haven't always been the mode of exchange though; just as one example, the Romans used salt for at least some of their wages, it's where we get the word "salary".
I'm not saying we "must" do anything, just that these are some of the likely issues we'll need to address for humanity as a whole to survive and these are some of the possible current solutions, imperfect as they are.
We've survived Ice Ages and Lord knows what else as a species, although numbers were decimated, so I'll be surprised if humanity doesn't survive what's to come. But the world will look very, very different from our own.
On your pv point, at present solar panels are not particularly effective unless you live in an area that gets a reasonable amount of sunshine, so in the UK they work reasonably well in parts of the West Country but not in some parts of Scotland. I'd be surprised if that technology doesn't continue to evolve though. Just as soon as our existing power companies work out how they can make a profit from it. As the ice continues to melt around the world I can't help wondering if tidal power or some kind of steam power will come into play.
I'd like to think we'll end up in a lovely Utopia like the one promised by Transition Towns and the like but I have a nasty feeling it's going to end up more like the Hunger Games, in the short-term at least.
Just as a final thought on water, which is ludicrously plentiful in western Europe and other areas, and yet pitifully scarce in, say, South Africa, what people sometimes forget until it's happened to them or someone they know is that when your house is flooded, it isn't usually nice, clean, sewage plant treated water. It's often raw sewage.
So that's another factor that needs to be taken into account; if floods are going to start happening more regularly, and the current trendline suggests that they are, then this is something that individuals and communities are going to have to start addressing themselves/ourselves.
It's no use waiting for the authorities to come along and help, or, as we've seen more than once in recent years, for the government to step in. Both Somerset and Sheffield know how futile that hope is, just as two examples.