Natural records trapped in fossilized pollen are revealing the first detailed picture of changing climatic conditions in the northeastern United States over the past 2,500 years.
Studying fossil pollen contained in lake sediments, J. C. Bernabo of the Environmental Data Service, NOAA, determined that recent decades are the warmest in the upper Midwest since 1200 A.D. Long-term trends in the same area showed that annual rain and snowfall since 600 B.C. have increased 50% with some overall cooling. Reporting on his work at the 1978 AGU Spring Meeting, Bernabo said that his initial Research in Michigan shows that the past 30 years in this region have been warmer than any similar period in the last 775 years.