The Little Ice Age was a period of cooling that occurred from the 16th to the 18th century.

Overgrazing by livestock was the primary cause of the Dust Bowl, which led to widespread soil erosion and dust storms.

The Great Famine in Ireland was caused by a potato blight that destroyed the potato crop, which was a staple food for the Irish population.

Agriculture, particularly the expansion of cattle ranching and soybean farming, was the main factor driving deforestation in the Amazon rainforest.

The Medieval Warm Period was a period of relatively warm climate that occurred from the 10th to the 13th century.

Coal burning for heating and industrial purposes was the primary cause of the smog problem in London during the 1950s.

The Dust Bowl occurred during the Great Depression, which was a period of economic hardship in the United States.

Industrial pollution, particularly the emission of sulfur dioxide and nitrogen oxides, was the main cause of acid rain in Europe and North America.

The Roman Warm Period was a period of relatively warm climate that occurred from the 1st century BC to the 3rd century AD.

Chlorofluorocarbons (CFCs), used in refrigerators, aerosols, and other products, were the primary cause of the ozone hole over Antarctica.

The Great Smog of London occurred during the Cold War, which was a period of political and military tension between the United States and the Soviet Union.

Carbon dioxide (CO2) emissions from human activities, particularly the burning of fossil fuels, are the primary cause of the greenhouse effect and global warming.

The Dark Ages is a term used to describe the period of European history from the fall of the Western Roman Empire in the 5th century to the beginning of the Renaissance in the 10th century.

Human error, including safety violations and poor design, was the primary cause of the Chernobyl disaster.

The Great Fire of London occurred shortly after the Great Plague of London, which killed thousands of people.