假如你是李华，你的英国笔友Donny给你发来电子邮件询问有关“地球一小时”的情况，请你根据以下信息写一篇英语短文，向Donny介绍有关情况以及你对此活动的态度。词数120~150。邮件格式已经给出，不计入总词数。
1.“地球一小时”是世界自然基金会(WWF)为应对全球气候变化于2007年所提出的一项倡议。
2.该活动起初只是一项号召悉尼居民关灯的活动，后来逐渐发展壮大成为全球最大的应对气候变化的活动之一。
3.2009年3月28日晚上8∶30，全球各地的人们为响应“地球一小时”活动而熄灯一小时。
4.你的态度……
Dear Donny,
Yours,
Li Hua
Dear Donny,
I’m very glad to tell you the event called “the Earth Hour” was launched by WWF in 2007 as part of a worldwide effort to raise awareness of climate changes.With the purpose of calling on the Sydney citizens to switch off lights originally,it snowballed into one of the
greatest global campaigns of dealing with climate changes.Luckily enough,there will be more people all over the world turning off lights for an hour at 8∶30 p.m.on March 28th,2009.
Towards this,I think it necessary for more people to learn about it and participate in it,with turning off lights for an hour simply.
Yours,
Li Hua
读图画意思，按照所给要点，合理安排，紧紧把握主题：“地球一小时”的情况来发表看法。