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

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?

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

Smog is essentially caused by the atmospheric presence of

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