Solar geoengineering aims to manipulate the climate by bouncing sunlight back into space. In theory, it could ease global warming. But as interest in the idea grows, so do concerns about potential consequences.

A startup called Stardust Solutions recently raised a $60 million funding round, the largest known to date for a geoengineering startup. My colleague James Temple has a new story out about the company, and how its emergence is making some researchers nervous.

So far, the field has been limited to debates, proposed academic research, and—sure—a few fringe actors to keep an eye on. Now things are getting more serious. So what does it mean for geoengineering, and for the climate? Read the full story.

—Casey Crownhart

This article is from The Spark, MIT Technology Review’s weekly climate newsletter. To receive it in your inbox every Wednesday, sign up here.

If you’re interested in reading more about solar geoengineering, check out:

+ Why the for-profit race into solar geoengineering is bad for science and public trust. Read the full story.

+ Why we need more research—including outdoor experiments—to make better-informed decisions about such climate interventions.

+ The hard lessons of Harvard’s failed geoengineering experiment, which was officially terminated last year. Read the full story.

+ How this London nonprofit became one of the biggest backers of geoengineering research.

+ The technology could alter the entire planet. These groups want every nation to have a say.

The must-reads

I’ve combed the internet to find you today’s most fun/important/scary/fascinating stories about technology.