Facebook的PHP代码对环境的冲击
Facebook在一个月前提供了与服务器规模相关的信息，他们使用了大约3万台服务器，多数服务器运行PHP代码去生成用户的社交主页。赶哥本哈根气候变迁讨论的东风：这些服务器将 产生多少二氧化碳？如果PHP代码用其它其它语言替代，将能减少多少二氧化碳排放量？
一台服务器的功率大约为200瓦，冷却和其它开销约400瓦。在美国，每千瓦时平均产生560克二氧化碳，Facebook的服务器每年共产生59 000吨二氧化碳。假使运行PHP代码的服务器约25 000台，如果用C++代码替代PHP代码，根据C++代码的效率是PHP代码的10倍计算，大约22 500台服务器可以关闭，这将减少49 000吨二氧化碳排放。当然，这对Facebook有点不公平，他们的服务器只占到全世界运行PHP代码的服务器总数的很小一部分。
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