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The grey areas show a wide range of statistical uncertainty.

 

The uncertainty has now diminished

 

One thousand years of little change-then dramatic increase in temperature in the 20th century. Human activity seems to be the most likely cause….and human activity with an increasing consumerist lifestyle

 

The rise in numbers-more people

 

The increase in industrial activity, agricultural production and in transport-more people doing more

 

Rising living standards-more people wanting more