The plan is supposedly aimed at tackling so-called climate change by cooling the Earth.
However, experts have been raising the alarm that such practices could have a devastating impact on the Earths natural climate.
Last month, Bill Gates-funded University of Washington researchers sprayed reflective aerosols into clouds over the ocean near San Francisco Bay.
The practice, called marine cloud brightening, allegedly aims to cool down the surface below and reverse global warming.
However, a peer-reviewed study published in the prestigious Nature Climate Change journal raises major concerns about the practice.
The researchers found that the experimental geoengineering methods may reduce heat exposure in the region significantly.
Alarmingly, though, they warn that the same interventions under mid- century warming minimally reduce or even increase heat stress in the Western United States and across the world.
The study teams lead researcher, UC San Diego oceanographer Jessica Wan, told The Guardian:
It shows that marine cloud brightening can be very effective for the US West Coast if done now, but it may be ineffective there in the future and could cause heatwaves in Europe.
Interestingly, the geoengineering experiment was later shut down by San Franciscos far-left officials.