Among the pessimistic opinions on climate change, Rachel Stewart writes that ''humanity cannot achieve stabilisation of (global) warming'' (Opinion, October 17).
This may be true but fortunately nature is already dealing with heat-retaining gases including those from burning fossil fuels.
Global warming is a natural phenomenon that for millions of years has created climates suitable for life on Earth. The tendency for the temperature of the atmosphere to increase is checked mainly by global evaporation from the oceans and forests.
As air becomes warmer it can hold more water vapour and also intensifies the evaporation process.
The climate then becomes wetter and cooler. Climate change has occurred many times and trying to alter the normal rate of change may bring unwanted consequences.