Stop laughing at the back!
The problem with discussing global warming is that it almost immediately becomes theological.
In fact I can already see some in the environmental lobby preparing to burn me at the stake. Obviously they will only use wood from sustainable forests which encourage bio diversity that has not been transported too far.
A few days ago I came across
this by Luboš Motl and
this by Iain Dale.
There is clearly a lot more we do not know about global warming than we do.
The first article by Luboš Motl goes on about how global warming does not seem to be happening in the Southern hemisphere, while Ian Dale queried David Miliband's numbers on CO
2 levels. These two things could be easily explained. The differing data on the Southern hemisphere may be because CO
2 levels there are lower, and the differing CO
2 numbers can also be explained because CO
2 levels vary by time of year and region.
We hear so many things on the subject from "Were all doomed!" so we might as well not bother to "it's a myth" and all of it in either theological or ideological terms. That is not way to deal with a serious scientific matter.
Still lets try and look at it sensibly:
- Is the world warming up?
- If it is, is it man made or is the sun burning hotter?
- Is there anything we can do?
- Could global warming be a good thing?
Is the world warming up?
Well it looks like it is. We have had a series of hot summers, and it seems some glaciers are melting. However the planet is not as hot as it has been in the past.
Is it man made, or could the sun be getting hotter?
Possibly, or rather probably. Scientists think it is man made because they have been looking at CO
2 emissions and concentrations of CO
2 in the atmosphere. CO
2 absorbs more heat from sunlight than either oxygen or nitrogen does, so the more of it there is about the more heat the atmosphere absorbs from sunlight. You can try an experiment at home. Get two similar clear plastic bottles and have one with only air in it, and fill the other with CO
2, then put a thermometer in both and put them in the sun. The one with mostly CO
2 will get a lot warmer a lot quicker.
CO
2 levels also vary by season, and place as levels of consumption and production vary by economic activity and plant growth.
Could the sun be getting hotter?
Well, it could be. I don't think we know enough about the cycles of the sun to be able to be anything like conclusive. The question is surely so what?
The planet would be ice bound with out any CO
2, so it follows that our behaviour can positively affect the state of our planet. If we take the right actions not only could we stop the rise in green house gasses but we could also reverse them, making up for the increase in temperature of the sun, if it is in fact happening.
Could global warming be a good thing?
In Roman times it is said they used to grow grapes as far north as Northumberland. So some places may look set to benefit, however at the same time Libya used to be the bread basket of the Roman empire and global warming won't bring that back.
It is clear that the world has both warmed and cooled over time, but generally this has happened fairly slowly. What we have here seems to me to be far too rapid. Mankind will definitely survive, but much could be lost, including a lot of people. Also the hunt to secure resources could end up in many expensive wars.
Lastly, the thing about global warming is that there will always be evidence pointing one way or another, and theories to explain how it is or is not happening. If we wanted to be rigorous we would arrange some sort of control experiment. Unfortunately we only have the one planet on which to do it. We therefor have to look at the balance of probabilities. We are only going to get one chance to get it right. More importantly fossil fuels are a finite resource, so we may as well develop the technologies to live without cheap fossil fuels now.
I will write an article on green taxes another day.