U.S. scientists say global warming is forcing NASA to build seawalls near major flight and research centers along the U.S. coasts.
A report by the Union of Concerned Scientists says rising sea levels are the greatest threat to the historic Kennedy Space Center, along the Atlantic Ocean in Florida. It says other NASA facilities already have faced costly damage from erosion and hurricanes.
NASA says it is essential that launching pads be located near water if a test flight has to be aborted in mid-air or a technical problem forces astronauts to make an emergency return to Earth.
Other key NASA facilities are located along the Gulf of Mexico and the Pacific.
The report says rising seas threaten other historic sites, including colonial Boston, Hawaiian state parks, and Liberty Island in New York Harbor.
Some reporting by AFP