Image via WikipediaDid you know that composting releases carbon dioxide into the atmosphere? Yes, it's true. So you may be wondering how is this an environmentally friendly thing to do.
Did you also know that when things decompose in the landfill, methane is produced? Methane is a much more powerful greenhouse gas than carbon dioxide.
The difference between the landfill and your home compost bin is air. An aerated compost bin is getting the oxygen it needs to undergo aerobic decomposition. The lack of oxygen in a landfill is causing anaerobic decomposition which as a byproduct produces methane.
That means that by composting your food and garden waste, you're keeping it out of the landfills and decreasing the amount of methane that going into our atmosphere. Not bad for a pile of garbage.
Obviously this is a very general explanation that doesn't take into account a lot of variables but you get the idea. A well tended compost bin is much better for the environment than sending all of your waste to the landfill.