Reuters: You just don’t want to make phytoplankton mad. These microscopic sea plants are at the bottom of the food chain in the waters that surround the Antarctic peninsula, and when they’re unhappy, everything that depends on them suffers, including fish, penguins and possibly, eventually, people. A new study published on Thursday in the journal Science indicates that some of these Antarctic phytoplankton have become increasingly grumpy over the last 30 years. Like most plants, …