1.Earth hour is the time that over 370 cities off their light for one hour.
2.It is held on 28 March 2009(Sat).
3.It is to show that by working together we can make a difference in the fight against climate change.
4.They would be sleeping or playing computer.(Me)
5.We can watch TV.
6.The earth is facing global warming and climate change.
7.We could walk instead of using a car.