Which of the following gases is primarily responsible for global warming?

Which among the following gas is primarily responsible for 'Global Warming'?

As a result of global warming, the frequency and severity of which of the following are increasing?

As a result of global warming the frequency and severity of which of the following are increasing?

Methane gas is emitted from which of the following sources?

The ‘Ramsar Convention’ relates to which one of the following areas?