Triggering Climate Change

The evidence was beginning to mount in the 1950s that climate was not a static geographic feature. Callendar's warnings from the late 1930s and early 1940s seemed to be more realistic with each passing year. The climate specialist Helmut E. Landsberg (1906-85) noted that there had been a noticeable warming trend on both sides of the northern Atlantic since the turn of the century. The Swedish glaciologist and climatologist Hans Ahlmann (1889-1974) pointed to the retreat of Iceland's Aobrekke glacier as evidence of warming. The MIT meteorologist Hurd C. Willett (1903-92) had examined global temperature data and reported that most of the warming occurred north of 50°N latitude. Between 1890 and 1940 scientists had recorded a 30 percent decrease in the thickness of ice covering the Arctic Ocean and a decrease in horizontal extent of almost 15

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