Unit4_Global_warming课件25(新人教版选修6）.ppt

;Can you tell what we use energy for? Energy lights our cities Energy heats our buildings Energy entertains us ( watching TV; playing computer etc.) …;Where does all the energy come from? ;a coal power station;an oil refinery ;;;;What’s the difference between wind power and coal power?;Try to tell as many as possible;negative effects of using energy ;;Pre-reading What is it in the picture? It’s a greenhouse made of glass. What is it used for? It’s used for growing plants, especially during cold weather. How does it work? The air inside is warm because the glass traps the heat from the sun and keeps it from escaping. This makes the greenhouse heat up and so the plants can grow throughout the cold period.;What is greenhouse gases?;Reading;;Should we do nothing about global warming?