Carbon dioxide is vital to all life on Earth. Without it, plants wouldn't be able to grow and produce the oxygen we breathe.  Yet an excess of CO2 is posing a real threat to the livability of the planet. As a greenhouse gas it traps heat in the Earth's atmosphere and CO2 levels have increased dramatically since the Industrial Revolution, driven primarily by the  burning of fossil fuels for energy and transportation. This is leading to a steep rise in global temperatures, with ever more severe