Where it was once desirable to trail clouds of glory, they now require emissions credits.

在那些曾经向往着可以拖曳荣耀的云霞的地方，它们现在需要排放额度。

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That means makers of heavier cars will be able to buy emissions credits from producers whose fleet is below the limit.

这就意味着重型车辆制造商将能够从车辆排放量低于该规定的制造商那里赊购排放量。

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For its money, Goldman Sachs gets a piece of a business expected to double in size when voluntary emissions credits become mandatory.

高盛花了这批钱，占据了这行业的一部分，而当自愿排放信贷变成法律强制时，整个行业的规模有望翻翻。

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If prices for emissions credits are volatile and companies and consumers incur losses as a consequence, political support for the program will falter.

WSJ: The Experts: Should There Be a Price on Carbon Emissions?

Until then, Navistar will continue to build and ship its current trucks, using a combination of earned emissions credits and fines to offset its polluting engines.

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For example, large companies like Google and GM purchase emissions credits from the carbon markets to allow them to claim that their overall carbon emissions is zero.

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