সঠিক উত্তর হচ্ছে: ১৯৭
ব্যাখ্যা:
- The Montreal Protocol on Substances that Deplete the Ozone Layer is the landmark multilateral environmental agreement that regulates the production and consumption of nearly 100 man-made chemicals referred to as ozone depleting substances (ODS).
- The Montreal Protocol on Substances that Deplete the Ozone Layer is a global agreement to protect the Earth’s ozone layer by phasing out the chemicals that deplete it. When released to the atmosphere, those chemicals damage the stratospheric ozone layer, Earth’s protective shield that protects humans and the environment from harmful levels of ultraviolet radiation from the sun.
- Adopted on 15 September 1987, the Protocol is to date the only UN treaty that has been ratified every country on Earth - all 197 UN Member States.
Source: unenvironment.org
