Oops having just gone a whole month without posting for the first time I hang my head in shame, however, I recently posted this to the NZ Skeptics group as the first part of a response to recent discussion about global warming and our response to it, a lot to the discussion was whether we should do anything at all, which partly came from the idea that since China and India weren't going to do any thing then what was the point ruining the economy. But some of it seemed a bit too much like AGW denial, so I started with the following discussion, which I will reprint below just in case there are those out there that don't know the arguments for anthropogenic global warming. The second part discussing what we can do will follow.
- Is the globe warming?
- Is there an increase in CO2 levels that began about the time of the industrial revolution?
- Is this a similar pattern to what happened in most other warming periods?
- Do we know what was responsible for much of the previous warmings?
- Is that what we are going through now?
- What about the influence of the sun? It caused the Little Ice age in the late middle ages did it not?
So we can easily establish that the neither the Sun nor the eccentricity of the Earth's orbit is to blame for this warming. So having ruled out the two leading causes for historic climate change we turn to other hypotheses.
- The obvious one is that we know CO2 is a greenhouse gas, can this leading trend of increasing CO2 be responsible?
Let me just restate that clearly, CO2 driven climate models can reproduce the recent warming that we have experienced.
- Is this a smoking gun?