Regarding Humans cant cause climate change (Letters, May 16): Over the centuries the climate has changed, true, but there are reasons for it. For thousands of years, the carbon dioxide remained at about 280 parts per million. Today it is above 560 ppm, more than would be considered normal, and its still rising.
This has come about because of the Industrial Revolution, starting around 1840, and by the tremendous increase in coal energy output, deforestation, billions of vehicles spewing out CO2 as well as the worlds population increase. Combined, it creates the greenhouse effect.
This greenhouse effect is now the cause of erratic climate patterns, melting glaciers, ocean temperature changes. When we place a lid of CO2 over the planet, the heat caused by the sun striking the Earth remains within the Earths atmosphere and this causes temperatures to rise. The average temperature has risen more than 2 degrees since 1970. When an individuals temperature rises by this much, we would call a physician to prevent further complications.
It is now up to us and those living in countries throughout the world to act. This is not only for us but for generations to come. This will be expensive, requiring lifestyle changes. In the end, it will save our planet.