Read the passage given below. Fill in any four of the blanks by choosing the most appropriate word / phrases from the given options.
One of the (a) ....... problems faced by the world today (b) ....... global warming. Many scientists believe that the production of carbon dioxide and other greenhouse gases is having a heating effect on the atmosphere and this (c) .......... be very dangerous for human life. We (d) ........ examine the problem of global warming and suggest some ways (e) ........... solving it.
