A British cargo ship carrying fertilizer was sunk on Friday after being attacked by Houthi rebels off the coast of Yemen, potentially causing an environmental disaster in the area, according to a report from U.S. Central Command. The Rubymar was attacked by a Houthi anti-ship missile on February 18 but remained afloat for several days, allowing British authorities to rescue the 24-person crew. The ship had been slowly taking on water since the unprovoked attack. Read: The ship finally sank, carrying 21,000 metric tons of fertilizer intended for Bulgaria, raising concerns about the impact on ma…