A less exotic approach, endorsed by Dr Crutzen, would be to spread tiny particles in the upper atmosphere to reflect the sun's rays.
克鲁特森博士提出并认可了一项较为实际的方案,那就是在大气层的上层散布大量的微小粒子来反射太阳光线。
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However, this approach does not work well if you have a layered architecture, with subsystems in the upper layers dependent on the capabilities of subsystems in the lower layers.