As research on greenhouse gases and global warming continues, this brief video from NASA’s Goddard Space Flight Center explains how instruments like CERES and MODIS are providing researchers with long-term trend data on Earth’s heat balance. Aqua CERES: Tracking Earth’s Heat Balance Is the heat budget of the planet changing? Thermometers on the ground can give us a snapshot of a summer heatwave or winter cold spell, but it takes something like NASA’s CERES instruments to give a long term picture of whether the planet is keeping more of its heat than it loses back into space.