The chart below, drawn from the WEO, illustrates the size of the problem America faces.
下方的图表取自WEO，展示了美国所面临问题的严重性。
People began to be aware of the importance of environmental protection after the weo sand storms.
在经历了两次沙尘暴后，人们开始注意到环保的重要性。
To achieve this, the WEO estimates that renewable and carbon-efficient fossil-fuel energies will have to expand their share of the energy mix from 19 to 26 percent by 2030.
要达到这个目标，该报告估计，再生能源和节能型碳化石燃料将它们在能源结构中的比重必须由19%提高到2030年的26%。
To achieve this, the WEO estimates that renewable and carbon-efficient fossil-fuel energies will have to expand their share of the energy mix from 19 to 26 percent by 2030.
要达到这个目标，该报告估计，再生能源和节能型碳化石燃料将它们在能源结构中的比重必须由19%提高到2030年的26%。
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