Originally Posted by
73qanda
I agree that solutions to climate change issues will come from engineering and science but why would we need to?
I’m all for cleaning up our act a bit but not sure why CO2 has such a bad name.
Can anyone explain with a bit of data ?
Cheers
The long answer is all those IPCC (Intergovernmental Panel on Climate Change
https://www.ipcc.ch/ ) studies that examine climate change and its causes very, very extensively.
I certainly haven't read all of those studies and reports. But I have read enough to get a good picture.
1) Global warming is a fact. In Physics, something is considered "discovered" if without it, the likelihood of the experimental results it at least 5 standard deviations away from normal. The evidence for global warming goes way beyond that criteria.
2) To go much further, we need a climate model. And we have many of these - none are fully convincing. But there is one sure thing that can be said: CO2 is a major factor. You can create models that include changes in water content, solar effects, contrails, etc - but if you don't include CO2 in your model, your model will not work.
3) You will often hear statements such as: "If we don't keep CO2 levels down, we will loose 1 million species over the next century." In most cases, they are based on good arguments and are good likelihoods. But there are a few problems with these statements.
They suggest that if we do control CO2 the bad result will not happen - in most cases, that's just false. In other cases, it is pushing the models well beyond their predictive powers. For example, even if we miraculously brought CO2 level back to what they were in 1900, that might not be enough to end climate change. Agriculture pumps huge amounts of water into the air and water is a far more potent green house gas - though one that is not persistent.
They also suggest that what we would need to do to avoid or reduce the consequence would be worth it. In the extinction example, they don't mention that that would leave 2.5 million species. I think most people would be happy with 2.5 million species in exchange for job security.