To catalyze global environmental activities, the Earth Day Network developed its "a Billion Acts of Green" campaign as another theme for Earth Day 2011.
为了促进全球的环境活动，地球日网络提出“十亿绿色行动”作为2011年世界地球日的另一个主题。
To catalyze global environmental activities, the Earth Day Network developed its "a Billion Acts of Green" campaign as another theme for Earth Day 2011.
为了促进全球的环境活动，地球日网络提出“十亿绿色行动”作为2011年世界地球日的另一个主题。
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