更为重要的是，渐进式政策开出的药方看起来太象是在对整个地球进行一种冒险的实验。

Even more important, the policy-ramp prescriptions seem far too much like conducting a very risky experiment with the whole planet.

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当银河圣母公司为乘客提供地球大气层上空亚轨道的短途太空旅行服务时，太空冒险公司正计划把乘客送到更远的地方，提供更长时间的太空之旅。

While Virgin Galactic is offering quick sub-orbital jaunts to just over the Earth's atmosphere, Space Adventures is planning to take its customers even further, for longer.

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另一个不那么冒险的做法，便是逐渐去除大气中足够量的二氧化碳，从而使地球降温。

A less risky form of climate engineering would be to gradually remove enough carbon dioxide from the atmosphere to keep the planet cool.

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