Renewable energy will have its time, when it is ready -- and that time is coming. By 'ready', I mean 'when it is cost competitive with other technologies'. I recently read that one Chinese solar manufacturer has achieved < $0.50/watt cost for PV module production, and it hasn't bottomed out yet. At the current rate of declining equipment prices, it doesn't matter how cheap oil is, eventually solar will be cheaper ... and when that happens, we will be living in a solar-first world faster than anyone can imagine.
The next question is how to deal with troughs in production due to the weather, and for that I really do hope we get back in the business of reactor innovation, because nuclear is the only option that provides the reliability of fuel-based power with 0 carbon output.
If the price of oil consumption keeps falling, that indicates high supply, which indicates that the "deadline" for non-fossil fuels is pushed further into the future, where there most-assuredly will be improved technology. One of our patent system's broken assumptions is that without economic incentive, no one will invent new technology. Mr. Jonas Salk would like a word with you, patent system. Breakthroughs in clean energy will continue, with or without economic incentive.
That's true, for the definition of "the environment" being: "the environment that humans and all of humanity's dependencies exist in currently."
That environment may or may not change dramatically(1), and humans and animals and plants as they exist now may not exist in the future, but I would guess that life in some form will survive, and if you define the environment to be "earth and its atmosphere," it will survive as well. It just may not have humans or animals or plants in it. Who knows.
(1) I'm not a climate scientist, but it seems like dramatic changes in our environment may well be guaranteed already. That said, I don't know for sure, so I'm being careful with my language.
I'm just trying to be a pragmatist. I am a staunch advocate of conservation and of the environment. I think those that have downvoted me have mistaken me for someone who is disagreeing with climatologists. However, that's on me for not communicating effectively. I should have made that stuff into a separate post or just not posted at all, lol.
What I'm saying is that it in the long run, humanity may well be doomed for the things we've put into play in the environment. That would be bad. I don't think that we'll kill off ALL living organisms. Earth will definitely survive, and I think that life on Earth will also likely survive. That life may well only be single celled organisms. Who knows.
I also conserve where I can - I heat my home with renewable fuel, for instance, installed a whole-house energy monitor to reduce consumption, upgraded to a 95% efficient backup furnace (most alt fuel heat is not as reliable as lpgas, unfortunately), and I'm going to pull the trigger on solar probably in 4-5 years (waiting a couple more tech generations). So in no way interpret the following to mean that I'm not for conservation where possible.
Having said that, like you, I think that people get extremely hung up on global warming without pragmatically looking at the environmental cost will be if it keeps going for another 50 years. Warming over the last 18 years has been minimal, and if we have similar warming for another 50 years, that would provide enough time for solar to become economical and efficient without pushing the second and third world back into poverty -- because let's face it: at this point in history, limiting carbon generation also limits the productive capacity of an economy, and lowers the standard of living for everyone involved.
Yes, we might have to move our farmland a bit north, lose a bit of coastal land area, and reduce biodiversity a bit. If this is the price to save millions of human lives through better nutrition, better medical care, better transportation, better housing, etc ... then in the short term, I think we need to proceed with any far-reaching carbon regulation with extreme caution.
Right now, I think that the most pragmatic and practical thing to do is research, improve, and build out nuclear power. Unfortunately, many of the same people who are staunchly anti-combustion (I can't say 'anti-fuel', since technically radioactive material is also fuel) are also anti-nuclear. To those people, living in this world, with the primitive energy storage tech that we have today -- without a hard dose of pragmatism you'd be living in the cold and dark during a Michigan winter, and I can tell you that -10f is COLD :( (we don't get a lot of sun and wind here during this time of the year)
After living with nuclear naysayers for decades (and rolling my eyes at them), I hate to be a nuclear naysayer myself; but there's been some use of "pumped hydro" for storing electricity generated by solar power.
The principle is simple: build a hydroelectric dam and run it in reverse. Of course, this can't be done everywhere; you need a lot of peak solar production, a lot of water, and an easily-dammed valley, and you don't often see all three together... But it does get used to store power, and solar plus pumped hydro represent a kinda-sorta alternative to nuclear.
They're also anti-nuke. I've even heard people who are anti-wind (the watchword is "birdchoppers") and anti-solar (since solar panels wreck desert ecologies)... Let's just say it's a good thing they aren't responsible for development.
The next question is how to deal with troughs in production due to the weather, and for that I really do hope we get back in the business of reactor innovation, because nuclear is the only option that provides the reliability of fuel-based power with 0 carbon output.