但是从那时起，林地变得越来越有价值，不仅是因为伐木业，而且因为它所提供的环境服务，例如控制洪水，调节气候等。
Since then, however, land has become more valuable, not just for timber but for providing "environmental services" such as flood control, climate change measures and amenity.
环境学家说任何全球性的气候交易必须将二氧化碳含量控制在450ppm以下，尽管一些悲观的科学家认为整个大气二氧化碳含量正在向550ppm，甚至650ppm迈进。
Environmentalists say that any new global deal on climate must restrict the growth of CO2 levels to 450ppm, though more pessimistic scientists say that the world is heading for 550ppm or even 650ppm.
这些常规的控制测量手段工作量大，作业时间长，受气候、环境等条件影响显著，而且误差积累显著。
These conventional control survey method work loads very big, work time long, condition influence and so on the climate, environment is been remarkable, moreover the error accumulates remarkably.
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