Thanks for posting. I have seriously been wondering - if global warming really is a problem, isn't the most cost-effective and obvious solution to increase our cloud cover? We all know it's cooler in the shade. I pose this to the anti-CO2 crusaders in comments and they never have a good response...

Bill Gates and other foundations are substantially funding the project, and aerospace companies are thought to be taking a business interest in the technology’s potential.

Scientists hope to complete two small-scale dispersals of first water and then calcium carbonate particles by 2022. Future tests could involve seeding the sky with aluminium oxide – or even diamonds.
“This is not the first or the only university study,” said Gernot Wagner, the project’s co-founder, “but it is most certainly the largest, and the most comprehensive.”