Christian Science Monitor: Scientists concerned with the biological effects of climate change are focusing on what some call "the grass of the sea." These are tiny water plants known technically as phytoplankton. Like the green grass on which cattle feed, these little plants are at the base of many food chains in lakes and the ocean. Other tiny animals feed on them and, in turn, become food for larger critters. Knowing how phytoplankton’s abundance is changing in different locations is crucial to understanding what …