Interfering with Earth’s climate systems is becoming more possible—and less predictable—than ever.

After a deluge of record-breaking rainfall this week, citizens of the United Arab Emirates and Oman are still trying to return to regular life. The storms forced schools, offices, and businesses to close, transformed the tarmac of Dubai’s international airport into a rippling sea, and killed more than 20 people across both nations. The downpour seemed almost apocalyptic: On Tuesday, the UAE received the amount of rain that usually falls in an entire year.

Early reports of the weather event prompted some speculation that it was worsened by a controversial weather-modification technology. The practice, known as cloud seeding, involves spraying chemical compounds into the air in an effort to wring more rain out of the sky. The United Arab Emirates carries out hundreds of these operations every year in an effort to supplement its water resources in the arid landscape. Exactly how well cloud seeding actually works is an active debate among scientists, but the technique can’t produce rain clouds out of thin air—it can only enhance what’s already there.

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