然后Google利用这些可以在市场上交易的期货性质的许可证，来抵消自身运作中的碳排放，进而保守住碳中立的承诺。

Google can then use these RECs (which are commodities that can be traded on markets) to offset its carbon emissions from its operations, and help with its pledge to become carbon neutral.

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例如，在商业的活动中，一个常规的货物可能到港，并需要与另一批到期货物在继续航运前合并，一切都可以通过信用证完成。

For example, in a trader's business, a regular shipment may arrive in port and require combination with another shipment due, before being shipped on, all this done under a DC.

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