Everybody these days is talking about their carbon footprint – well if they care about the planet they are. A carbon footprint is a measure of how much carbon dioxide is released  into the atmosphere as a result of the activities you undertake. Carbon dioxide is an important greenhouse gas that helps to trap heat in our atmosphere. Without it, it would be too cold to live on this planet.  It’s also important to plants – carbon dioxide is vital for plant and animal process, such as photosynthesis and respiration (breathing – that’s kind of important, don’t you agree?). But too…