Consider so many other situations in science. Sure, the science of global climate change is pretty darn solid. What mankind might develop in a couple of decades will truly make this knowledge seem antiquated in 10-12 years.
The whales were all but extinct just a couple of decades ago. Consider the holes in the ozones layer, now fixed. Few whale species are even challenged. So, it is with the truly horrible plastic crisis.
So too it will it be with energy. Sure, there will be enormous changes due to humans warming the planet. Our actions have caused the Arctic Ocean to melt, and parts of Greenland to be habitable for the first time in centuries. There will be a Northwest Passage at great gains to lots of countries. And many countries will see the negative effect, including that of the increase in storms.
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There are lots of ways to reverse our production of CO2. We might even do it by directly reducing the amount in the atmosphere through chemical intervention (a dangerous course). We can build a few thousand nuclear plants and almost never use oil. And yes, there will be measure we can take, 10, 20, or 30 years from now.
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Are you old enough to recall the dangers of nuclear winter? How about overpopulated the plant by 2000?
Climate science is much better. The evidence is certainly better. nThe earth si definitely getting warmer.
HOWEVER, and it is a big however, there are winners and losers. Governments will need to decide what to do, and in what ways they want to change the trends. There are great areas of the world that may benefit from warmer temperatures, perhaps Canada, Russia and China. Others would benefit from cooler temperatures, perhaps most countries near the equator, and countries with many people or industries being greatly sensitive to few feet rise in ocean sea level.
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CONCLUSIONS
1) Global warming hurts most, but helps many others.
2) There will always be ways to change the path of global warming. The question are costs and political will. We certainly could ban all meat, and all fossil fuel transport after building nuclear plants.
3) If necessary, there can be many, many strategies and options that we cannot even imagine that could be available in 20 years. The moon landing program took less than a decade. Given current computers, a program to reverse or stop global warming could be developed in the same amount of time.
Not entirely certain what your point is, but indeed, whether the 10-12 year estimate that is currently out there is totally accurate or not, there WILL come a time when we will be powerless to address the problems just from the stand point of non-equilibrium warming as I discussed at length.
The science of anthropogenic global climate change is pretty durn solid. Right now we are just trying to figure out when we will likely pass the point of no return.
It's not a matter of "if"...it's now a matter of "when".
We're already seeing the thin point of the blade enter...it only gets worse from here unless we start making some changes quickly.