Today is the earth hour, which if you mean to support the earth
you should join them and off the lights in your house for an hour.
An hour means a lot if your whole town is supporting this.
woooooooooooo!!
In addition, don't switch on the air-condition at night, particularly tonight.
The temperature is lower at night.
Hence, it isn't necessary to switch on the air-con.
Besides, put recycle bags in every single bags/handbags you have.
P.S. that's what I do usually.
Be environmental friendly.