Do not burn Styrofoam or polystyrene. It is made using benzene, a known human carcinogen. Benzene is released into the air if the polystyrene is burned.
Polystyrene makes up a significant part of the Great Pacific Garbage Patch, a slowly rotating collection of plastic in the centre of the North Pacific Ocean Gyre. There are 3.3 million pieces of plastic per square kilometer in the garbage patch. Over 8 billion kilograms of plastic ends up in our oceans each year, much of it polystyrene. These plastics don’t biodegrade, but rather break into increasingly smaller pieces, which can cause harm or death to sea birds, fish, turtles and other marine life.
Using as little polystyrene as possible, and recycling what you do acquire in a responsible manner, is one of the best things you can do for the health of our marine and terrestrial ecosystems.