I enjoyed the Big bang theory column. Cast your mind back to the period 1937-1947. Practically every major city in the northern hemisphere was producing weaponry of all types. Factories were belching out smoke. During 1947 Europe suffered a very harsh winter. If you believe the temperature of the Earth is now increasing as a result of pollution, and the odd volcano: which is it? Normal natural cyclical weather change, or the careless people on Earth?
Lyall Klaffer Urrbrae