If the greenhouse warming effect of the resultant increasing atmospheric CO2 is as great as the most advanced current models suggest, a critical level of warmth will have been passed in high southern latitudes 50 years from now, and deglaciation of West Antarctica will be imminent or in progress. Deglaciation would probably be rapid once it had started, and when complete would have led to a rise in sea level of about 5m along most coasts.
–Prof. John H. Mercer, 26 January 1978
12 July 2017
A trillion-ton iceberg totaling 2,240 square miles, or 12% of the Antarctic peninsula, and 40 trillion cubic feet of ice — a volume twice that of Lake Erie — today broke free from the Larsen C ice shelf in Antarctica. Following the collapse of the Larsen A ice shelf in 1995 and the Larsen B ice shelf in 2002, today’s calving further weakens the entire continental glacier and sets in motion what scientist believe is the first stage of total glacial collapse. [Read more…]