Kim O'Hara wrote:
In one more attempt to show you why we don't take much notice of some of your sources, I took one of your favourite graphs (you have uploaded it several times, so you must like it) and added a red rectangle (near the right hand end, where it belongs) to which is (as close as I can make it) 6 million years wide. It therefore represents the period since our evolutionary line split from that of all the other apes - not just the time since our ancestors learned to walk on two feet, not just the time since they discovered fire, waaaay longer than the time since they first built houses.
Here it is. I had to stretch the image a bit from side to side so that you can see the red rectangle clearly. I'm sorry that makes the text a bit hard to read, but you can refer to your own copy if you need to.
1. Where did those sudden, catastrophic, changes go?
2. Can you add, at the same horizontal scale, a rectangle showing the time since the Egyptians built the pyramids?
Can you please tell us the exact point you are trying to make, so that I answer your question? It may be a good point, but please explain it better.
Can you provide your best argument, in your own words?
Here is what I understand:
- The earth was undergoing climate change for 4.5 billion of years. Not only after industrial revolution by homo sapiens.
- The earth was warming and cooling on its own for 4.5 billion of years. So it isn't correct to predict warming to catastrophic levels.
- We are actually in COOL period of where the earth's climate has historically been, so it is quite natural that temperature may go up and down. If we compare current temperatures with the coldest part in the past ~20K , then yes, it looks very scary. But this is deliberately showing only a little amount of information to create a wrong impression. If we look at the bigger picture, such as the one spanning 400K years, we will see that there is nothing unusual in that spike. If we look at the chart showing 500 or so millions of years, we will see that current temperatures are indeed unusual. They are in one of the coldest periods this planet has been. The context and time scale does matter. Deliberately choosing a very narrow time span where the temperature was increasing, without showing the reference where the temperatures have been before, shows selection bias.
I would like to see (I haven't yet) AGW proponents of comparing and contrasting modern climate with historical climate that occurred hundreds of millions of years ago. Lets see the numbers of CO2, average global temperature, precipitation, storm levels, etc. Without having sufficient data to compare current events with, we could get skewed and one sided cut out like I've provided above (co22.jpg). Maybe there were 100x as much storms in Cambrian (for example) than today. So compared to Cambrian, we are in heaven! So little storms! The earth's weather is almost silent!
As I have shown in another chart, in the past 400,000 years there have been 3 major spikes in temperature. Today's 4th major spike (at the right of the picture) is NOT bigger (it looks smaller than the one at 350K years ago
) or more rapid than previous ones (approximately 150K, 250K, 350K
To me, it is a concrete proof that nature itself could be the explanation for changes in temperature. If we require humans to be the required cause for temperature change, then it would make previous temperature spikes hard to explain. If current spike was REALLY different from previous ones, then the natural explanation may not work. But the current spike is not more severe or rapid than the previous ones. The main argument about CO2 is incorrect:..CO2 lags an average of about 800 years behind the temperature changes-- confirming that CO2 is not the cause of the temperature increases. One thing is certain-- earth's climate has been warming and cooling on it's own for at least the last 400,000 years, as the data below show. At year 18,000 and counting in our current interglacial vacation from the Ice Age, we may be due-- some say overdue-- for return to another icehouse climate!http://www.geocraft.com/WVFossils/last_400k_yrs.html