David MacKay: David MacKay: 对开发可再生能源的理性思考

David MacKay: 对开发可再生能源的理性思考

到底需要多少土地来用再生能源去供应能源给英国这样的国家呢？一个国家的用电总量会是什么样子的呢？在这个务实的演讲里，David MacKay 通过一些基本的计算方法向我们阐释了可再生能源的一些令人担忧的制约，并向我们解析尽管有各种不利因素，我们也要发展这一能源的原因。（本视频在英国华威郡的TEDxWarwich拍摄）

Replacing fossil fuels with renewables demands a scale few realize—covering up to a quarter of the UK with wind farms or solar parks just to meet current needs. Renewable energy sources are much more diffuse than fossil fuels or nuclear, so their land demands are enormous. Simple calculations show biofuels alone would require verges as wide as eight kilometers along every road. Building a sustainable energy future means making tough, fact-based choices about technology, land use, and consumption.