I was thinking about this the other day: what _is_ the best scientific statement we can make, at present, about anthropogenic global warming? On one hand, we have theory. There's reasonably good theoretical reasons to expect that increasing carbon dioxide should increase global temperatures. However, every good scientist knows not to trust theory too much until it's been verified by experiment, especially when the sy…
Here's what it seems like:
1. The Earth is warming at a slow rate, but at least some of this is natural as temperatures were historically considerably higher, then considerably lower than now.
2. We're still well within the bounds of normal, habitable historical temperatures.
3. Warming definitely occurs at local levels with deforesting, mining, and urbanization. This can decrease condensation and make areas less habitable to life. This can be stabilized to a large extent by planting trees, restoring soil quality, and so on.
4. Carbon dioxide currently makes up 0.3% of the greenhouse gases including water vapor, and about 5% of the non-water vapor greenhouse gases. Carbon dioxide increases are lagging temperature increases - suggesting that CO2 is not the biggest culprit of global warming.
5. That said, fossil fuels will gradually be replaced - the two current biggest hurdles are battery quality and political/public fears about nuclear power. Nuclear has gotten incredibly more stable and safe, and the advent of thorium reactors is exciting. Innovations in batteries and transitions to next generation nuclear will reduce fossil fuels a lot.
6. Much of green technology isn't so green - in many areas, turbines and solar panels take enough energy to create that they won't "pay back" their energy cost within 50 years, at which point we'll likely be able to produce energy much cheaper anyways. Some areas are very well suited for green energy - deserts with solar, very windy areas with turbines, hydroelectric on rivers, but they're brute forcing some very Earth-unfriendly alternative energy into areas it's not well suited for. Much of what's called green is marketing.
Personal judgment call based on everything I've seen? Money into R&D for hydrogen power, better batteries, fusion, and safer next-gen nuclear probably goes a lot further towards cleaning up the Earth than the current proposed solutions. Fossil fuels seem like they're going to largely be obsolete within 100-150 years or sooner, and rumors of the Earth's imminent demise appear to be greatly exaggerated.