Getting Warmer?

JANE S. SHAW & RICHARD L. STROUP

Beginning last summer, as a severe drought and record heat dried up fields and streams across the United States, a big story hit the headlines: the earth may be getting dangerously warmer. James E. Hansen, a scientist with the National Aeronautics and Space Administration (NASA), told a congressional hearing that the evidence is “pretty strong” that the greenhouse effect had begun to operate.