SEAFLOOR SCRAPING
Bottom-trawling nets, which scrape up anything in their path in pursuit of fish, have left their mark on 20 million sq. mi. (52 million sq km) of seafloor.
Bottom-trawling nets, which scrape up anything in their path in pursuit of fish, have left their mark on 20 million sq. mi. (52 million sq km) of seafloor.