GEOLOGY

Detailed explanation-1: -But in the early 1980s, through a combination of ground-based and satellite measurements, scientists began to realize that Earth’s natural sunscreen was thinning dramatically over the South Pole each spring. This thinning of the ozone layer over Antarctica came to be known as the ozone hole.

Detailed explanation-2: -In 1986 and ‘87, expeditions to Antarctica confirmed a development that left the world on edge: chemicals called chlorofluorocarbons (CFCs), found in many personal hygiene products, had caused a hole in the ozone layer that was only getting bigger.

Detailed explanation-3: -By 1987, just two years after the hole was discovered, an international treaty was in place that cut the use of CFCs in half. Three years later in 1990, the Montreal Protocol was strengthened to ban the use of CFCs altogether in industrialised countries by the year 2000 and by the year 2010 in developing countries.

Detailed explanation-4: -It is a monumental achievement. The Montreal Protocol, finalized in 1987, is a global agreement to protect the stratospheric ozone layer by phasing out the production and consumption of ozone-depleting substances (ODS).