Consider the following statements: Chlorofluorocarbons, known as ozone-depleting substances, are used: 1. in the production of plastic foams2. in the production of tubeless tyres3. in cleaning certain electronic components4. as pressurizing agents in aerosol cans Which of the statements given above are correct?

The stratospheric ozone layer is most severely depleted by which class of atmospheric pollutants?

Consider the following statements related to biochar: 1. It is produced by the pyrolysis of biomass. 2. It can increase the soil fertility of acidic soils and help to increase agricultural productivity. 3. It is used for carbon sequestration and thus helps mitigate climate change. Which of the statements given above are correct?