They saw no rain effect even when it poured for seven days straight.

即使连续下7天大雨，他们也没有看到任何“降雨效应”。

It's linked to global warming, acid rain, effects on wildlife, depletion of the ozone layer.

空气污染和全球变暖、酸雨、野生动物保护、臭氧层耗竭这些问题息息相关。