<http://schema.org/about>
"For ages, sailors have used copper-based paint to cover their hulls. The copper kills algae, barnacles and other sea creatures that attach themselves to the hull. Basically, it is so poisonous that nothing can withstand it. Unfortunately, the copper"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/corporate-responsibility/alternative-to-copper-paint-on-ships-hulls.html>