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Professor Keith Clayton: Pioneering environmental scientist

In 1967 we didn't know that man-made chemicals could hole the stratospheric ozone layer. The term "global warming" had not been coined, and the link between climate change and human activities was not well-made. Some scientists thought a new ice age was approaching in the coming decades, not believing that polar and glacier ice would be melting at record rates, leading to unprecedented rates of rises in sea level.