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This kind of topic is always so difficult to broach because it's so poorly understood. I'll make a couple points though
Catastrophe: We're already in catastrophe, and we have been for a long damn time. The thing is that you and me and the few lucky ones don't really see that due to ignorance. One billion people starving daily, twenty-three million prisoners in US alone, 100k suicides a year, the list goes on and on with things that are simply horrible, yet because they're normal to us, we do not realize the horribleness.
Human life itself is a sort of Stockholm's Syndrome. Nobody wants to hear this or admit to it, but our very existence is wrought with all sorts of unfathomable misery. Catastrophe is standard. The difference is that instead of individual or even regional catastrophe, we're now facing a new global and collective existential catastrophe.
Energy: This is not as big an issue as many believe. Our problems are not so much about limited resources, but with limited rate of production. There is a pretty big economic bright side to peak oil and increases in energy cost, but you won't hear many people talk about it. In fact, I've only seen one professional lecture on it, but that's largely because there are not that many people who are experts in both fields of economics and energy.
Anyways, as the price of oil gets high enough, we will begin to see a return from globalization. We will begin to see jobs returning for localized purposes. An example of China having all US manufacturing jobs is largely dependent upon oil being cheap enough. Once it's no longer cheap enough for transportation across the Pacific and all that, manufacturing will return to the US. There is a bright side to energy costs going up
Global Warming: This is the real kicker. The research is developing very rapidly, and it's all pointing in the same trend. That trend is something that even most climate scientists don't wanna admit, but are gradually coming around to. Every year or so, the projected worst-case scenario is being pushed back as mild.
Just a few years ago the Arctic ice caps were gonna stick around during summer all the way till 2100, then to 2050, but now we're predicted to have ice free Arctics in just 2020. Just a couple years ago, we believed that the current level of greenhouse emissions we've achieved would only account for like .5 degrees warming, but now we have reason to believe it's closer to 5.0 (will just take time to settle, the climate doesn't react to stimuli overnight). Just a few years ago we thought that it would be many, many decades before we triggered unstoppable feedback loops like permafrost melt, but today we think we may have already gone past.
Global Warming is going to turn our world into something unrecognizable. Scientists are only slowly beginning to see this for what it really is, but even then they don't wanna admit the doom to themselves and their families. On top of that, geophysicists and the like have very awful understandings of other sciences like economics and politics, and honestly they make egregious mistakes in predictive analyses because of it.
The ocean is going to be fish-less this century. There is no ifs ands or buts about it. While fishing has ravaged fisheries' magnitudes, that won't be what kills oceanic life. We've already begun to see enormous drop offs in plankton, they're going to go completely, virtually everything else will die off then, and the oceans will gradually develop overwhelming acidity and anoxia. Oceanic CO2 uptake is already rapidly slowing. That sign is unfathomably dreadful. We basically know for a fact that the oceans are fucked, just that it takes a lot of time to see the effects. Human time perception is nothing compared to geologic time
In turn, the anoxia, if enough of a feedback is triggered, will annihilate all life on Earth. It's happened many times before, we don't know exactly how it happens, but the safe money is on things like returning the levels of carbon and methane into the atmosphere that we know we are and will.
Before that possible anoxia, however, we will see the most unfathomable events unfold like Antarctica breaking up before 2200. Before that, systemic famine and desertification. Our ONLY possible respite will be a futuristic technology of incredibly powerful artificial trees that capture and sequester the gases. I don't know how likely that technology is to be developed, but it is last resort, and if it happens you can bet your ass that most of the planet is a dust bowl
To the naysayers, get a clue. Global warming killing everything is fucking fact. A basic understanding of geological history determines this. All that carbon and all that methane that scientists predict we will release into the atmosphere was once in this atmosphere, and at that time, there existed no lifeforms even remotely close to mammals. Opening up the oil wells, coal mines, and permafrost is more than enough established geophysical and chemical reactions to shoot our global temperatures far, far beyond 10C warming. 10C is what scientists say is a virtual doomsday. Actually, that's not true. They say that about 6C. Admitting 10C hasn't been something they can cope with yet, but it won't take more than just a couple years for that to happen. Only a few years ago, 2C wasn't something most climate scientists could admit to themselves
My personal hope is that we do annihilate ourselves. I mentioned human life itself being like Stockholms, but it runs much, much deeper than that. The amount of unstoppable suffering in the world is astronomically larger than the amount of joy, and it will only get worse.
The first great evil was the development of agriculture. That provided for human societies that we have not been biologically evolved for, and the misery has abounded because of it. The second great evil will probably be known as computing technology. At some point in our future, we will achieve things like perpetual consciousnesses, and with that, some will endure perpetual suffering. Just like how the ability for humans to suffer chronically became a reality upon the development of agriculture, the ability for humans to suffer at astronomical magnitudes beyond current levels will be made possible by computing technology
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