I think that there is a basic misunderstanding among many people about the global warming crisis that’s looming. The problem is not about heat production i.e. concrete gives off a lot of heat as it’s curing, it’s not about burning wood, it’s not about humans or animals breathing or farting. What it is about is pouring tons of fossil carbon in to the atmosphere. Fossil Carbon is the carbon that has been locked up as oil or coal for millions of years; we are releasing it faster than it can be locked up again.
The earth is not heated by human or animal activity it is heated by the sun. The sun warms the earth and that energy is radiated back off into space. Over the past million or so years there has been equilibrium between the amount of carbon that enters the atmosphere and the amount of carbon that is locked up again as plant and animal, biomass. Burning wood does not change this burning fossil fuels does change the balance. Pouring tons of carbon into the atmosphere changes the amount of heat that the earth radiates back into space.
The new Saab 9-3 is a hybrid that uses 100% ethanol. So here we have a technology that is carbon neutral. It is a technology that I hope General Motors, Saabs parent company, jumps all over. Read all about this new car at the auto channel