HD Osborn's letter arguing that we humans have not contributed to the warming of the earth uses the arguments of one who chooses to believe oil company propaganda rather than applying common sense and logic.
Dismissing the argument without even considering our contribution to the fastest rate of climate change for 10,000 years seems incredibly arrogant.
Unless Mr Osborn believes that the earth has moved to a larger or smaller orbit - which would surely require a large change in the earth's mass or some other large external force - the incoming radiation falling onto the planet will remain largely constant whatever the angle of rotation or any wobbles.
However, moving 3.8M giga-joules of energy from strata deep below the earth's surface and releasing it and the accompanying products of combustion into the atmosphere every day is likely to have significant effects on our environment. And that's just the crude oil.
Steve White, Max Fordham LLP building services engineers, s. white@maxfordham. com