I HATE to be the harbinger of bad news to D Bonham (Letters), but despite the copious amounts of wishful thinking applied to their letter on the subject of climate change, the reason that they haven’t received any response is down to the fact that the cross-section of people who read the letters pages of local newspapers are rarely large enough to include any ‘climate change experts’.
The first thing that must be noted in addressing D Bonham’s points is the fact that humans are not the only thing that can release greenhouse gases; events such as volcanic eruptions release huge amounts of carbon dioxide, methane and the like into the atmosphere, but eruptions as large as Krakatoa, responsible for “the year without a summer” in the 19th century, are almost as rare as the evolution of a fossil-fuel addicted industrial species, which is why rapid climate change doesn’t happen very often.
Volcanic activity can cause warming through its release of greenhouse gases, or cooling through flooding the skies with ash. Collisions with asteroids can also cause cooling by flinging lots of junk into the sky. As I’m not a climatologist, I don’t know if any of these were the causes of the Ice Age 12,000 years ago, but those are some of the events that can cause the kind of rapid change we see today.
Another point worth mentioning is that the causes of the Ice Age 12,000 years ago may well have been down to very slow and gradual change, quite unlike the situation today.
If you actually bothered to ask Friends of the Earth or the Green Party, I’m sure they’d be able to tell you all about it.
Finally, the effect of humans breathing out is so small as to be basically negligible.
Joel Butler, Pierce Avenue, Olton