A Sand County Almanac at 75: the evolution of the land ethic
A lot changes in 75 years. In 1949, when Oxford University Press published Aldo Leopold’s A Sand County Almanac with “The Land Ethic” included, there were about 2.5 billion people alive on Earth. The atmospheric carbon dioxide concentration was just over 310 parts per million. The average global temperature was 0.6 degrees Celsius below the average for the twentieth century.