graphic image showing the planet in gray and white with dark green throughout the oceanFor NASA’s Earth Observatory, Lindsey Doermann writes about new research showing that our oceans are turning more green. Caused by growth of phytoplankton, this shift was predicted by climate-change models, although researchers can’t yet pinpoint the specific ecological factors causing the change. Doermann explains how researchers worked with data captured by a NASA satellite to detect the change over a period of only 20 years, using a new method measuring all visible light. Image: Public domain / NASA