How to Travel Eco-Friendly AND Save Money: A carbon footprint is defined as the total amount of greenhouse gases produced to, directly and indirectly, support human activities. This is usually expressed in equivalent tons of carbon dioxide (CO2).
The key phrase here is ‘directly and indirectly support human activities’. What it means is that people may or may not know that what they’re doing is harming the environment. Everyday activities like driving your car, cooking your food, keeping your home warm or cold, and everything else in between all add up to your carbon footprint.