John Tatum claims the global warming theory is clear (Letters, March 14). In which case perhaps he, or someone else, can explain the following.

I have read that 95 per cent of the CO2 in the atmosphere comes from natural sources and only five per cent from human activity. Therefore if the human race disappeared it would only reduce five per cent of CO2 in the atmosphere. How then can mankind make any noticeable difference ?

It seems obvious that as the earth's temperature rises so the amount of vegetation and animal life will increase and hence the amount of CO2 emitted. A report in the journal Science in January showed that, using information from ice cores since the last ice age, every time the temperature and carbon dioxide levels have shifted, the carbon dioxide change happened after the temperature change. The man-made global warming theory has put effect before cause.

  • Chris Gould, Georgia Avenue, Worthing