PCHiway wrote:Looking at it philosphically, if I remember my Hegel correctly then AGW proponents are in a big mess. If a thesis contains no flaw then there can be no antithesis. Without the antithesis...no synthesis.
Quite so. Science has it's own terminology for this stuff. It is called 'falsifiability'. A hypothesis is not scientific if it cannot be falsified (hence, intelligent design by a supernatural power is not falsifiable and so is not regarded as a valid scientific 'Theory')
So, if 'AGW' is not falsifiable, then it too is not a valid theory.
'AGW' is not a single theory. It is based on lots of theories and even some 'Laws' (a scientific Law is a Theory that is so strong that despite being falsifiable, it has been proven to be true, which itself is easier said than done). So each of those components is falsifiable, and if shown to be false would then mean that 'AGW' is at the very least in question (a single component being shown to be false may not bring down the whole thing as there are lots of parallel streams which build in redundancy).
So,. if the physical properties of CO2 are not the same as science has told us, then that would take a big chunk out of the theory. If someone could show that CO2 does not absorb heat in the way that our current knowledge suggests, then there would be a major challenge to AGW as it currently stands (it would also put a big spanner in a lot of other things in other areas of science, by the way).
But AGW includes at high level the following theses:
1) The climate is changing
2) That change includes an underlying trend, which is to get warmer on average over time
3) Greenhouse gases are one of the major factors in climate
4) Levels of greenhouse gases have changed in recent times
5) Those changes in levels of greenhouse gases are causing a large part of the underlying trend
6) Human activity produces greenhouse gases
7) The human contribution is a major factor in the change in levels of gases in the atmosphere
Now, each of those statements is falsifiable (or, to use your terms, has at least one 'antithesis'). Let's run through one thing for each of that list which would falsify it:
1) We find that the climate is not changing
2) We find that there are trends, but warming is not one of them
3) We discover that other factors (solar effects, geothermal/tectonic) are the primary drivers in current trends
4) Levels of gases are not much different to 200 years ago
5) The changes in levels are not enough to cause climatic change, or are offset by other factors to such a degree as to be of minimal net impact
6) Humanity does not cause more of these gases to be emitted than absorbed
7) Other sources far outweigh the net change in the levels of greenhouse gases.
Now, this is just a short list. There is more to it, and possible multiple ways to falsify each thesis. But there's a start.
Min X - you are actually wrong. In this respect, all science is like Maths. The difference is that for a lot of maths there is a proof that a falsifiable Theory is not false, and so it becomes a Law. That it has been proven not to be false does not make a Theory unfalsifiable. Many other sciences have theories which are falsifiable, which we have not yet proven to be completely true, but at the same time we haven't been able to find them to be false.
AGW is falsifiable.
That commentators claim otherwise, or claim that it is not false does not alter that fact. In short, PCH, AGW does have antithesis. Lots of it.