[单项选择]Discussions about reducing greenhouse gas emissions usually concentrate on cleaner ways of generating energy: that’s because they promise that we can lower emissions without having to change our energy-hungry ways. But whereas new generation techniques take years to come on stream, efficiency can be improved today, with existing technologies and know-how.
To calculate how much energy could be saved through such improvements, Julian Allwood and colleagues at the University of Cambridge analysed the buildings, vehicles and industry around us and applied "best practice" efficiency changes to them. They found that 73 percent of global energy use could be saved by introducing such changes.
Many people are unaware of the scale of opportunities for reducing energy demand, says Allwood. By showing how global energy demand can fall to a quarter of its current level without any decline in services, the team hope to redress the balance. "We think it’s pretty unlikely that we’ll find a g
A. development of the current technology
B. the investment of capitals and fund
C. how the efficient technology is used
D. the standard for energy consumption

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