Another important mission, blasting off in late February, will help resolve some of the biggest uncertainties in our understanding of climate change. NASA's Glory satellite will add to over thirty years of high-precision measurements of solar energy output, and will help keep track of any small changes in solar irradiance. Glory will also try to sort out how aerosols, floating particles in the atmosphere that absorb and reflect energy, affect the Earth's energy budget. Clearing up these uncertainties will be invaluable for accurately predicting the fate of our warming world.