The major event in 2010 that led to environmental damage in the Gulf Coast region was The Deepwater Horizon oil spill.

The Deepwater Horizon oil spill happened in April 2010 when offshore drilling(Offshore drilling refers to the process of drilling for oil and natural gas beneath the ocean floor.) rig operated by BP( British Petroleum) exploded, releasing millions of barrels of oil into the Gulf of Mexico. This spill caused extensive environmental damage to marine life, beaches, and coastal ecosystems. It is considered one of the worst environmental disasters in U.S. history. The other events listed—Hurricane Katrina, the BP Refinery explosion, and the Galveston flood—are significant, but they occurred at different times or locations.