This new study looks in more detail at the effect of a half-hour delay on school start time by asking students to fill in questionnaires at the start and end of the three-month study.
In April the European Parliament forced the European Commission, which had been set to ratify the standard, to delay its vote pending further study.
4月份,欧洲议会对欧盟委员会施加压力,要求其暂时推迟新准则的投票,以等待更进一步的研究结果。
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Indeed, a study in 2007 calculated the climate mitigation benefits of the ozone treaty as totalling the equivalent of 135bn tonnes of C02 since 1990, or a delay in global warming of seven-12 years.