假设你是李华你的美国朋友chris给你发来e－mail询问你校正在开展低炭生活的活动，请写一封回信

One possible version:
Dear Chris,
I'm happy to receive your email asking about what we are doing to promote a low-carbon lifestyle. Now let me tell you something about it.
A campaign with the theme of "Actions Make a Difference" is going on in our school to call for a low-carbon life. For means of transportation, we now take buses, ride bicycles or walk if we can. Besides, we choose to use e-cards instead of traditional greeting cards. We only print things out when necessary, and print double-sided. And we try to save water and electricity in our daily life. For example, we are encouraged to have a shower instead of a bath, which uses far less energy and water. We always remember to switch off all appliances and lights when we're not using them.
What about you? Looking forward to your reply.[来源:高.考.资.源.网]
Yours,
Li Hua