The problem is that there might be some term we do not foresee or that the level of linearity breaks down sooner than expected and irrelevant forces became stronger..
Difficult to foresee... but the more we push the parameters (as the CO2 in the atmosphere..) the more changes we will find vey upleasant scenario..
that is why glboal warming will be either a grave phenomena or a catastrophe in 100 years... who knows?
A pleasure I therefore claim to show, not how men think in myths, but how myths operate in men's minds without their being aware of the fact. Levi-Strauss, Claude
We might be reaching such a threshold for climate gases, as the earth system's capacity for taking up CO2 is diminishing. See this guardian article.
