A puzzle to me

Perhaps Julia Owen (Herald letters) or someone else can explain one of the things that puzzles me about the global warming theory.

I have read that each volcano emits more CO2 than 1,000 years’ worth of all of the motorised transport in the world. This may or may not be true, but obviously it must be a vast amount. If it is true, then there is no point in motorists worrying about their CO2 emissions.

To be so certain about their claims, climate scientists must have taken volcano emissions into account, so how did they measure them?

Chris Gould

Georgia Avenue