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One scientist's steady measurements became climate science's most famous graph.
Starting in 1958 at Mauna Loa in Hawaii, Charles David Keeling measured carbon dioxide in the air. The record, still continued, shows CO₂ rising year after year.
Why it matters: Long, careful measurement is how we know the atmosphere is changing.
Keeling Curve — Charles David Keeling (1958)
Mauna Loa Observatory
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The world once fixed a planet-wide problem together.
In 1985 British scientists reported a deep seasonal loss of ozone over Antarctica. In 1987 countries signed the Montreal Protocol to phase out ozone-destroying chemicals; every UN member later ratified it.
Why it matters: The ozone layer is slowly recovering — proof that global cooperation can work.
Large losses of total ozone in Antarctica reveal seasonal ClOx/NOx interaction — Joseph Farman, Brian Gardiner and Jonathan Shanklin (1985)
Nature, vol. 315 (1985); Montreal Protocol (1987)
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One book made the world look twice at pesticides.
Rachel Carson's 1962 book documented how pesticides such as DDT harmed birds, fish and ecosystems. It sparked public debate, and the United States banned DDT for agricultural use in 1972.
Why it matters: One well-researched book can change national policy.
Silent Spring — Rachel Carson (1962)
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