Name: 大衛麥凱：務實探討再生能源。
Uploaded: 2012-05-26T14:31:37Z
Duration: 18 min 18 s
Description: 再生能源廠需要耗費多少土地興建，才能有足夠的產能以應付像英國這種國家所需？全國規模。這場務實的演說中，大衛麥凱以基本數學為導覽向我們解說，選擇永續能源有哪些令人憂慮的限制，並解釋為何我們仍須以其為目標。 (Filmed at TEDxWarwick.)

David MacKay: 大衛麥凱：務實探討再生能源。

大衛麥凱：務實探討再生能源。

再生能源廠需要耗費多少土地興建，才能有足夠的產能以應付像英國這種國家所需？全國規模。這場務實的演說中，大衛麥凱以基本數學為導覽向我們解說，選擇永續能源有哪些令人憂慮的限制，並解釋為何我們仍須以其為目標。 (Filmed at TEDxWarwick.)

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.