Question

Montreal protocol, passed in the year 1987 Kyoto protocol, held in 1997 in japan are related to-
(a)Protection of ozone layers to decrease the levels of greenhouse gases which results in global warming
(b)Global warming and protection of the ozone layer
(c)Protection ozone
(d)Global whining

Answer 1

Hint: In 1973, chemists Frank Sherwood Rowland and Mario Molina, who were then at the University of California, Irvine, began researching the effect of CFCs on the Earth's atmosphere. They discovered that CFC molecules were robust enough to stay in the atmosphere before they got up in the middle of the stratospheric region where they would eventually (after an average of 50–100 years for two typical CFCs) be broken down by ultraviolet chlorine atom radiation.

Complete answer:
 In 1987, 27 developed countries signed the Montreal Protocol, an agreement intended to protect the stratospheric ozone layer. This Protocol allows for the production and consumption of greenhouse gases such as CFC, CCl4and methyl chloroform that depletes ozone in the stratosphere should be phased out by 2000.
The Kyoto Protocol was signed in Kyoto in 1997. The Protocol focuses on global warming as a result of the growing use of greenhouse gases such as $CO_2$, $CH_4$, nitrogen oxides, and CFCs to combat climate change.

Additional Information: Ozone depletion is a significant environmental issue because it increases the amount of ultraviolet ( UV ) radiation that enters Earth's surface, which increases the incidence of skin cancer, eye cataracts, and damage to the genetic and immune systems.
Global warming is the long-term heating of the Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activity, mainly the combustion of fossil fuels, which raises the temperature of greenhouse gases in the Earth's atmosphere.
so, the correct answer is ‘Protection of ozone layers to decrease the levels of greenhouse gases which results in global warming’.

Note: The Montreal Protocol on Substances that Deplete the Ozone Layer, also known simply as the Montreal Protocol, is an international treaty intended to protect the ozone layer by phasing out the development of a variety of substances responsible for the depletion of ozone. It was signed on 26 August 1987 pursuant to the Vienna Convention for the Defense of the Ozone Layer of 1985, which formed the basis for international cooperation on the management of ozone depletion.