原因在于，当碳被标价时，那些实行的减排措施中成本最低的将会先实施。
The reason is that when carbon is priced, those emissions reductions that are least costly to implement will happen first.
其他减排措施-比如森林再造-可以创造就业以及其他的社会效益。
Other measures to reduce emissions – such as reforestation – generate jobs, along with other social benefits.
但即便是这一成本，仍比其他许多类型的减排措施来得便宜。
But even that would be cheaper than many other sorts of mitigation.
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