If you continue to display thesameimageon thescreen for a long period oftime, partof that image mayburn into the screen and leave a ghosting image behind.
Some people burn weeds or bury them deeply or make them into mulch.
VOA: special.2010.08.10
The Algenol bioreactors also produce oxygen as a byproduct and that can be fed into a power plant to burn coal more cleanly.
VOA: standard.2009.09.02
But you sacrifice a bit with 16:9 because they force traditional programming into a pillarbox format, with black bars on both sides--and if you're not careful, the bar pattern can burn itself into the screen.