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All of this makes the net benefit of reforestation extremely difficult to measure .

所有这一切都使得重新造林的纯利益极难估算。

Nine west african leaders agreed this week on a 20-year plan to rescue it by reforestation and removing silt .

为拯救它，9位西非国家领导人于本周共同签署了一项20年重新造林和清除淤泥的修复计划。

Even if we are making progress elsewhere on air pollution , water pollution , or reforestation , what difference does it make when we are overheating the planet ?

即使在别处我们对于空气污染、水污染或者重新造林正取得进步，然而当我们的星球过热的时候，又有什么区别呢？

We have planted hundreds of thousands of young trees on public lands in all 50 states of the united states and in theinternational tree planting countries as part of their reforestation programs .

我们作为国际植树计划重新造林项目的一部分，在加入该计划的国家以及美国的所有50个州的公共土地上种植了成千上万棵幼树。

Through afforestation , reforestation and cutting down agricultural emissions , by one estimate , carbon dioxide equivalent to 40 parts per million could be extracted from the atmosphere by 2050 .

据估计，通过造林、重新造林和减少农业排放，到2050年，可以从每百万单位的二氧化碳减除约40单位。