To test the stratospheric particle injection for climate engineering (that's right: SPICE) project, the team will first send a smaller hose-augmented balloon up just over half a mile, pumping plain water into the air just to test the feasibility of piping particles into the sky. If it looks like they can reasonably stabilize a balloon and hose system at that altitude, work could go ahead on the real deal: a balloon that could be some 650 feet in diameter that would soar all the way into the stratosphere, elongated garden hose in tow.