1. See Summary.

   2. The fuels that increase greenhouse effect and cause acid rain when burned are the fossil fuels.

       The gases released are carbon dioxide and sulphur dioxide.

       Carbon dioxide increases greenhouse effect.

       Sulphur dioxide causes acid rain.

   3.  The power station that produces radioactive waste is:

        d) Nuclear

   4.  The two statements about hydroelectric power stations which are false are:

        b) They take a long time to start up

        d) They are not very reliable