Compared to any previous geological events, this is 20 times faster, has a 5 times greater magnitude, and the effects are lasting, not temporary. That accounts for a quite significant difference. Additionally, all models, even those presented by the sceptics, show that CO2 increase will cause warming, but with a delay - i.e. the effects of today's CO2 emissions will not become apparent until in years, decades, centuries or even millenia from now. Depending on how great the delay is, we could be in really serious irreversible trouble.
Secondly, very few, even among the most sceptical, are arguing the following statements:
1. currently we have a global warming that is 20 times faster and with 5 times greater magnitude with lasting effects than any known event in the geological past
2. the CO2 levels are currently increasing towards levels present far back in time, when earth was unsuitable to human life, especially life for people with white skin
3. higher CO2 (and other greenhouse gases) levels in the atmosphere will alone, if we assume this is the only change made, cause higher temperature equilibrium on earth than without it. This means unless a CO2 increase is coupled with a counter-effect, temperature will increase as CO2 emissions increase. Here, plenty of global warming sceptics are speculating wildly with little evidence and incomplete models. One example:
"When trees are chopped down and desertification increases, this will give the earth surface a different color where the desert arises, and this could perhaps reflect light better than does a forest, and therefore perhaps the deforestation could, to some extent, compensate part of the global warming effect caused by less CO2 being bound as the trees are chopped down. "
However this is pure speculation. Unless it can be proven that the effect of desert colored ground compensates the less CO2 bound fully, this won't solve the problem.
4. in the earliest days of earth, when most coal was unbound and free in the air, temperatures were incredibly higher - earth was a hell of lightnings, fires and lava. The most complex form of life that could exist, were RNA strings without capsules, i.e. an organism more primitive than one-cell organisms, difficult to at all call a life form.
The binding of the coal to living organisms who would die and be bound below earth surface as sediment is what crucially decreased temperatures enough to allow the appearance of plants and animals. Additional crucial coal binding below earth surface was required before human beings could live on earth.
Now we're digging up that bound coal, and freeing it into the atmosphere by burning fossil fuels.
5. evolution allows humans and other species to adapt to changes, including climate changes, but there's no way evolution can cope with a massive change in temperature over less than 1,000 years, without resulting in mass death with very small survival chances for most species, including humans. Human beings, despite technology, has no advantage over other animals in this case: our evolution is no faster than for other animals.
6. in cold weather, we can use heating mechanisms (that emit greenhouse gases and increase earth temperature) and clothes to compensate for the cold. In hot climate, we have no way of colding ourselves except by air conditioning, which increases CO2 emissions even more, and increases the temperature even more ad absurdum.
7. pollution is strongly correlated to temperature increase. This correlation is significant, because of the 20 times faster rate of increase than in any geological event seen in the past, it's 5 times greater magnitude, and the fact that the correlation fits so closely.
8. sun cycles, which were taken as a counter-example to global warming a few years back, have been counter-proven. In fact, we are currently in a low activity part of the sun cycle, and that would suggest a temperature decrease. Despite this, the temperature continues to increase rapidly. This suggests that the sun cycles account for very little of the climate changes.
9. a provably higher percentage of CO2 and other greenhouse gases than the pre-industrialization levels have been emitted into the atmopshere.
Currently, we anually emit around 2% of the entire amount of CO2 already present in the atmosphere. That means we double the amount of CO2 in the atmopshere in 50 years.
Bookmarks