联合国环境署呼吁推动航天活动可持续发展
4月12日是载人空间飞行国际日。联合国环境规划署在该纪念日到来前发表声明，呼吁国际社会关注人类航天活动带来的环境挑战，推动对外层空间的可持续利用。 声明说，联合国环境规划署与联合国外层空间事务司联合分析了航天活动可能带来的环境影响。火箭发射以及航天器重返大气层可能影响大气化学组成
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