监测、报道和核查机制处于“上流”-换句话说就是把监管工作放到化石燃料的卖家而非买家-时，事情就简单得多了。
Monitoring, reporting and verification mechanisms are much simpler when schemes are "upstream" - in other words imposed on sellers of fossil fuels rather than buyers.
然而，鉴于中国不愿对其温室气体排放监测、报告和核查透明化，中国产品上的条形码是否可信则是个疑问。
However, given China's reluctance to be transparent concerning Monitoring Reporting and Verification over greenhouse gas emissions, will bar codes on products supplied from China be credible?
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