Earth Day will be celebrated around the world on Saturday, April 22, 2023. But what led to its debut in 1970?
The holiday launched as a nationwide teach-in following a decade when many young Americans embraced social and political change. Among the more transformative movements of this era were a push for civil rights, opposition to the Vietnam War—and a call to protect the environment.
The First Industrial Revolution was a period of scientific and technological advancement that lasted from the mid-18th to the mid-19th century. Research suggests it also coincided with an uptick in carbon dioxide levels in the atmosphere—and an effect on the climate.
One of the first key readings of the health of planet Earth was revealed in a zig-zag pattern known as the Keeling Curve. The upward trending curve represents a daily record of CO2 levels and has been called one of the most important scientific findings of the 20th century. Read more.
Among the Apollo program's most endearing legacies was not just the moon landings, but also photographs of Earth from orbit. The images revealed our world—and its fragility—from space. See more photos.
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