Solutions for the atmospheric pollution

Gap-fill exercise (Pablo Acosta Robles)

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!
   carbon dioxide      coal      cycling      energy      greenpower      heat      ozone      trees      ultraviolet      wind   
We should save at home switching off lamps and electrical sets when we don't need them and closing doors and windows to avoid the scape during winter. We also should save energy walking or instead of using our cars.
Furthermore, we should stop burning oil, and gas and change them by (solar power, power, hydroelectricity...). Besides, we should stop cutting down because they produce oxygen and remove .
Finally, we should stop using CFCs because they destroy the layer which protect us from the rays.