Complete the sentences with the correct verb forms from 1

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
   adding      Burnt      Trapping   
1.  for energy, fossil fuels release large amounts of carbon dioxide into the atmosphere.
2.  too much of the sun’s heat, greenhouse gases stop it from escaping back into space.
3. As temperatures rise, polar ice caps melt faster,  more water to oceans.