China manipulates weather using cloud seeding.

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Quote:

Last year Beijing announced plans to expand its experimental weather modification program to an area 1.5 times the size of India – 5.5 million square kilometres – covered by artificial rain or snow. The State Council has said it aims to have a developed weather modification system by 2025, including another half a million square kilometres hosting hail suppression technologies.

I'm no expert, but this can't be a good thing surely? At the very least I'm not sure we fully understand the nature of weather systems, so the possibility of this having a negative knock on effect somewhere else seems fairly likely.