If global warming continues, the organism which may face more severe threat is

The given diagram represents the greenhouse effect.
$I.$ Greenhouse gases absorb infrared radiation from the earth. The absorbed radiations are again emitted towards the earth's surface,heating it up.
$II.$ $CO_{2}, CH_{4}, CFCs$ and $N_{2}O$ are the gases responsible for the greenhouse effect.
$III.$ An increase in the level of greenhouse gases results in considerable heating of the earth,leading to global warming.
Which of the statements given above are correct?

Which of the following countries is responsible for releasing the largest amount of greenhouse gases?

The major factor in causing global warming is

Which of the following represents the correct percentage contribution of greenhouse gases to total global warming?

Which country produces the maximum amount of greenhouse gases?