129th MEETING OF THE LYNCEAN GROUP OF SAN DIEGO
Date: Wednesday, June 26, 2019, 11:30 AM
Location: Southwestern Yacht Club
2702 Qualtrough Street
San Diego, CA 92106 (Point Loma)
Speaker: Jeff Severinghaus
Geosciences Research Division
Scripps Institution of Oceanography
UC San Diego
Topic: Climate Change: What have we learned about our future from studying ice-core climate records?
Air bubbles in ancient ice preserve the composition of the atmosphere, and tell us
the levels of carbon dioxide and other greenhouse gases in the past. From this
archive of air we know that carbon dioxide levels stayed below 300 parts per
million for at least the last 800,000 years, until humans started burning fossil fuels
around 1850 in the Industrial Revolution. Today carbon dioxide levels exceed 415
parts per million, and are rising. Prof. Severinghaus will show how we know that this carbon is not natural, but rather comes from burning coal, oil, and natural gas.