1903 - The Wreck of the Old 97, an American rail disaster that became the subject of a popular ballad (Source)
Recommended video:
Johnny Cash: The Wreck of the Old 97
1962 - Rachel Carson's book Silent Spring is published, inspiring an environmental movement and the creation of the U.S. Environmental Protection Agency (Source)
"In 12 years, we'll all be dead. An unstoppable force will wipe out all of humanity, most of the animals, and even some of the cockroaches. It's not climate change, it's the smugness of the true believers, the brainwashed masses of millennials who will one day be in positions to implement the absolute bat-feces crazy ideas they are espousing today."
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For further research on climate change/global warming...
More recommended reading, but first note: Although though the Authors of Science Left Behind (Below) believe in man-made climate change, this is what they have to say about one of the heroes of that movement:
"The publication of Rachel Carson's Silent Spring in 1962 was the real demarcation point when modern progressives left behind the scientific and uber-rational legacy of the past. From that point on they embraced radical environmentalism...Silent Spring used a lot of the same logic that anti-vaccine progressives use today: anecdotal evidence and dubious statistics coupled with generous doses of paranoia and very little science."
Recommended video:
1998 - The Google internet search engine retroactively claims this date as its birthday (Source)