● `color{violet}("UV radiation")` of wavelengths shorter than `color{brown}("UV-B")`, are almost completely absorbed by `color{violet}("Earth’s atmosphere,")` given that the ozone layer is intact.
● But, `color{violet}("UV-B")` damages `color{brown}("DNA")` and mutation may occur.
● It causes aging of `color{violet}("skin, damage")` to `color{violet}("skin cells")` and various types of skin cancers.
● In human eye, cornea absorbs `color{violet}("UV-B radiation,")` and a high dose of `color{violet}("UV-B")` causes inflammation of cornea, called `color{brown}("snow-blindness")` cataract, etc.
● Such exposure may permanently `color{violet}("damage the cornea.")`
● Recognising the `color{violet}("deleterious affects")` of `color{violet}("ozone depletion")`, an international treaty, known as the `color{brown}("Montreal Protocol,")` was signed at Montreal (Canada) in 1987 (effective in 1989) to `color{violet}("control the emission")` of `color{violet}("ozone depleting substances.")`
● Subsequently many more efforts have been made and protocols have `color{violet}("laid down")` definite `color{violet}("roadmaps, separately")` for developed and developing countries, for `color{violet}("reducing the emission of CFCs")` and other `color{violet}("ozone depleting chemicals.")`
● `color{violet}("UV radiation")` of wavelengths shorter than `color{brown}("UV-B")`, are almost completely absorbed by `color{violet}("Earth’s atmosphere,")` given that the ozone layer is intact.
● But, `color{violet}("UV-B")` damages `color{brown}("DNA")` and mutation may occur.
● It causes aging of `color{violet}("skin, damage")` to `color{violet}("skin cells")` and various types of skin cancers.
● In human eye, cornea absorbs `color{violet}("UV-B radiation,")` and a high dose of `color{violet}("UV-B")` causes inflammation of cornea, called `color{brown}("snow-blindness")` cataract, etc.
● Such exposure may permanently `color{violet}("damage the cornea.")`
● Recognising the `color{violet}("deleterious affects")` of `color{violet}("ozone depletion")`, an international treaty, known as the `color{brown}("Montreal Protocol,")` was signed at Montreal (Canada) in 1987 (effective in 1989) to `color{violet}("control the emission")` of `color{violet}("ozone depleting substances.")`
● Subsequently many more efforts have been made and protocols have `color{violet}("laid down")` definite `color{violet}("roadmaps, separately")` for developed and developing countries, for `color{violet}("reducing the emission of CFCs")` and other `color{violet}("ozone depleting chemicals.")`