Sunday, May 01, 2005

Is global warming caused by humans?

There is little doubt that humans have caused a massive increase in CO2 levels in the atmosphere since the start of the industrial revolution. However there is doubt as to whether this has anything to do with global warming.

The above graph shows that the length of the sunspot cycle (inverted) has a very close correlation to the northern hemisphere temperature fluctuations. Actually the severity of sunspot cycles would be a better measure, but the records are not so consistent as the period because the records were more sparce and the instruments not as good in the 1700s.

It seems then that a decent proportion of global warming is attributable to the Sun and not humanity. This does not mean that we are not having or will not have an effect or that we should be careless.

Another important question is whether global warming will last very long given that an ice age is due any time.


Blogger SS said...

This comment has been removed by a blog administrator.

7:35 pm  
Blogger SS said...

Hmm, this is interesting. I saw Al Gore's documentary and thought that global warming is caused by us (humans) and that we could prevent the melting of polar ice and the extreme weather patterns (hurricanes in USA, drought or excessive rain around the world) by just minizing the amount of air pollution we cause. Are you suggesting that that's not true since our impact on global warming is very little?

7:36 pm  

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