By maintaining their rainforests, tropical countries provide an invaluable global service, one for which they have so far failed to be compensated. But, especially after the signing of the Kyoto protocol, we can value at least part of these environmental services: carbon sequestration (that is, if they did not maintain their forests, the level of carbon concentrations in the atmosphere would be enormously higher).
通过保全他们的雨林，热带国家提供了一项难以计价的全球服务，而这种服务却远没有得到应有的补偿。但现在，特别是在《京都议定书》的签署之后，我们至少可以确定部分环境服务的价值：碳固定。（也就是说，如果他们没有保全其热带雨林，大气中碳集中的水平会比现在高出许多。）