Which one of the following is related to global dimming?

Which one of the following is the main reason of acid rains?

Which one of the following statements is true with regard to a greenhouse?

Ozone layer of upper atmosphere is being destroyed by which of the following?

The use of plastics has led to a number of environment-related problems. For this, which one of the following statements is correct?

Mercury is a toxic substance that severely contaminates land, water, air and the food chain. Which among the following is source of mercury pollution?