Question

If ozone levels in the lower stratosphere have been decreasing for 20 years, why are scientists just detecting that trend now?

Answer 1

How does the hole in the ozone layer affect global warming? The hole in the ozone layer in the earth'supper atmosphere (stratosphere) reduces the greenhouse effect because ozone is a greenhouse gas. However, ozone in the stratosphere filters out ultraviolet radiation from the sun that is harmful to life on earth.

Answer 2

Answer:

Our understanding of stratospheric ozone depletion has grown steadily since the mid-1970s, when Mario Molina and F. Sherwood Rowland first suggested that the ozone layer could be depleted by chlorofluorocarbons, or CFCs – research that earned a Nobel Prize. In 1985 Joseph Farman reported on the formation of an “ozone hole” – actually, a large-scale thinning of the ozone layer – that develops over Antarctica every austral spring.

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