When I was younger, in the '70s, I thought mass extinction was a real possibility due to overpopulation, pollution, resource shortages, etc. I really believed we were lemmings on hind legs rushing for the exits. I wore a ZPG T-shirt as if I needed additional help not reproducing, LOL
That was into the beginning of the second industrial revolution. I date that around 1965 and base it on a couple of automatic fly reels I own, one is pre '65, has all cut and/or forged gears, it is solid, virtually indestructible, and repairable. The other, post-'65 is all stamped sheet metal and a little plastic. It is light, irreparable, but disposable because it was cheap.
I'm not exactly sure why that came to mind except to show that things do change; sometimes for the better, sometimes not, sometimes both. In the 1960's the fertility rate in the US was 3.5 or so and recently it is 1.8 which is far below replacement. Population growth is entirely immigration in the US, and what the owners won't tell their temporary supporters in the anti-immigration party is that the owners like it that way, they need it that way. Not only do more consumers increase profits, more workers keeps down the ultimate evil— wages. Additionally, increasing population keeps the government retirement and health system payroll taxes flowing that might otherwise, heaven forbid, become the responsibility of the owners again.
Anyway, partly due to the effects of the ownership winning the war and the wage earner losing, I think this century will see peak humans, not because of die off but because of birth off. I've pointed out in several threads that the permanent recession, partly a result of the owners prepping for the end of the world by cutting their customer's throats, will see birth rates fall below replacement and perhaps fall dramatically further.
On this site our mascot is the black swan, but I think we get confused by "black" thinking that indicates not only the unexpected, but that the unexpected is always bad. Also reminiscing on the US, I can remember how bad the air and water was in the '70s, the black swan that time was a republican who, because of political expediency, created the foundation of the US environmental regulatory system. He also put the final stroke to the political black swan of the later half of the century that flipped uneducated rural whites and blue collar workers from their traditional union and worker oriented D party to the R party. The Rs had been the party of the owners and professionals and historically against our "Particular Institution". That was a biggie in recent US history because instead of economic issues dividing the parties, they became divided almost exclusively along racial and social lines.
And it is no better today. In fact probably worse because Obama just freaked people out. Lately he is closer to 50% approval than 40% but less than one in four uneducated white men approve, only 1 in 3 educated white men, race is the primary factor in his approval. The US obviously still has a real problem with race and I think Obama hurt more than helped by hardening the bias rather than softening it. Some of that is disapproval from the far left but it is more about race than we all would like to admit. Lets not kid ourselves, here in America we are still arming for The Uprising.
But I digress, lol. If shale is not the Grail then Ron could well be right and peak is now. If the US has another round left then peak will happen likely by 2020, gas a decade later and coal a decade after that so by 2050 we will be well downslope. Additionally and resultantly birth rates will have declined everywhere and humans numbers will peak around midcentury as in the UN low growth estimate.
So what enabled shale oil? There is no argument that expensive oil did it. Similarly, what enabled the dramatic decline in PV price over the last decade? ... same thing I think. The Manhattan Project of renewables will be the black swan that keeps us in ice cream and internet, not sure when it will happen but pretty sure we were on our way around 2010-12 in the US (other countries were ahead and always will be) but we had a little detour down the Old Frack Road. I'm pretty sure we'll get there. I've decided the energy fairy will keep the lights on; she won't be able to do it at a price that is too cheap to meter but that's OK.
Lest you get the idea that my outlook is all high tides and tall grass forever, those two green swans of population decline and expensive renewable energy will have enough dramatic consequences to satisfy the knarliest Doomster Diver. The US without huge energy surplus will lose standing and ability to project power, that obviously opens the door for the next contestant for Global Hegemon and of course that Means War! Likewise, resource constraints always Mean War!
Population and extraneous energy decline means the end of economic growth and eventually economic decline for everyone. Whether that means movement away from democracy and capitalism toward another iteration of rentier, feudal, oligarcial systems or, less likely from this point of view in the US toward a more socialist society in general I'm not sure. Regardless, that change will be hugely disrupting, for some it means extremely hard times, for others maybe not so bad.
I really have no guess as to the future of GW, it is a function of fossil fuel. I think the effects are real and could be big but don't really have the ability to get beyond the hype from either side. In fact I felt more vulnerable in Missouri during the drought of '11 than I do in CA currently because we had moved to the Ozarks in part because of the fact it was forecast to be hotter but wetter.
So the only other thing I can possibly think to say is that if I don't stop tapping and do something billable the economic black swan is gonna take a crap on my head sooner rather than later.
ETA: A link
http://www.theatlantic.com/politics/arc ... picks=true
The legitimate object of government, is to do for a community of people, whatever they need to have done, but can not do, at all, or can not, so well do, for themselves -- in their separate, and individual capacities.
-- Abraham Lincoln, Fragment on Government (July 1, 1854)