The far-reaching consequences of humans meddling with nature

Vulture population in India declined dramatically in the early 1990s after they ingested diclofenac, an anti-inflammatory drug routinely given to cattle.
Humans have been accused of damaging the planet in a variety of ways including overpopulation, pollution, burning fossil fuels, and deforestation.
Here are seven concrete examples of actions which have, often unintentionally, had massive, often fatal consequences.