Aerosols reduce primary productivity by

Which of the following statements is/are correct?
$I.$ Chemical fertilizers cause pollution of water bodies as well as groundwater,besides getting stored in crop plants. Therefore,environmental scientists are pressing for a switch over to organic farming.
$II.$ Organic farming is a form of agriculture that relies on techniques such as crop rotation,green manure,compost,and biological pest control.

Which of the following statements pertaining to pollutants is correct?

The Government of India passed the Environment (Protection) Act in the year $............$.

Assertion : The concentration of methane in the atmosphere has more than doubled in the last $250$ years.
Reason : Wetlands and rice fields are the major sources of methane.

The Kyoto Protocol has specified the commitments of different countries to: