Here we go again. I refer to the recent letter from the Civic Trust. “The civic Trust will argue for a sustainable, low carbon Bolton and etc. " Letters April 25.

Firstly, 'carbon' (C02), is not a pollutant, as is the impression conveyed. Another unfounded claim is that 'Mankind has severely disrupted the planets biosphere' and 'This is severely compounded by man made global warming.' No tried and tested scientific evidence exists to prove their hypothesis

Since 1998 until the present day a slight cooling trend has been observed. Earlier this century when temperatures failed to do what the climate alarmists predicted. ‘global warming,’ conveniently became ‘climate change,’ and as the last few months have been slightly warmer than predicted, ‘climate change,’ is now back to being 'global warming' again. You couldn’t make it up!

For the record, accurate temperature recordings only go back a 150 years or so. During the medieval warming period (850 – 1350) Greenland was colonised and farmed by the Vikings, impossible today without modern technology.

There are far more powerful influences at work that affect the earth’s climate than the tiny amount of C02 we humans excrete into the atmosphere. The sun, solar activity for example, the gravitational effects other celestial bodies in the solar system have on the earth's passage through space, its elliptical orbit around the sun, sometimes taking the earth closer too, or further away. The earth's angle of tilt which changes over many thousands of years, the wobble as it spins on its axis and the influence cosmic rays have entering the upper atmosphere on the formation of clouds. All these natural forces have a direct influence on the earth’s climate.

But I wonder who or what causes the sun to sink below the horizon in the evening? Who knows? That’s how daft this man-made global warming religion is. I prefer the more scientific approach to help explain the many causes of climate change

Stuart A Chapman

County Kerry

Ireland