Your front cover (NCE 8/15 April) asks the question 'Is climate change man made?'
with reference to the intention to carry out the boring of deep cores in the Arctic Ocean.
There is already evidence from cores taken in glaciers throughout the world, that it is not man made, and is part of the long term climatic cycle that our planet experiences.
At the start of the last decline in global temperature 130,000 years ago the carbon dioxide in the earth's atmosphere was almost 300 parts per million (ppm).
As the temperature dropped the CO 2 fell to 200ppm at the end of the ice age about 20,000 years ago. The variation in atmospheric carbon dioxide is due to the variation of radiation of the sea which is the main source.
Radiation variation is caused by extra-terrestrial factors such as the change in the earth's axis, the wobble of the axis and the changes in the earth's orbit from circular to elliptical or vice versa.
Although we humans have created a little extra CO 2it has a minimal effect on global warming which will continue naturally. Heat and power generation in its various forms does not need to be on our conscience.
HD Osborn (M), 15 Cowal View, Gourock, Renfrewshire, PA19 1EX