Carbon footprint is a measure of the total amount of greenhouse gases produced to directly and indirectly support human activities, usually expressed in equivalent tons of carbon dioxide (CO2e).

Transportation is typically the largest contributor to an individual's carbon footprint, accounting for about 29% of global greenhouse gas emissions.

Nitrous oxide (N2O) has a global warming potential 298 times that of carbon dioxide (CO2) over a 100-year period.

Agriculture is the primary source of methane (CH4) emissions, accounting for about 40% of global methane emissions.

Eating a plant-based diet is not a common method for reducing an individual's carbon footprint. While it can have a positive impact, other methods such as using public transportation or carpooling, conserving energy at home, and recycling and composting are more widely recognized and effective.

Carbon sequestration is the process by which carbon dioxide (CO2) is removed from the atmosphere and stored in forests, oceans, and other ecosystems.

Offsetting emissions through carbon credits is not a common method for reducing a company's carbon footprint. While it can be a part of a comprehensive strategy, it is more important to focus on reducing emissions directly through investments in renewable energy, improving energy efficiency, and reducing waste production.

Carbon intensity is a measure of the amount of carbon dioxide (CO2) emitted per unit of energy produced.

Oxygen (O2) is not a greenhouse gas.

Carbon offsetting is the practice of reducing greenhouse gas emissions by planting trees or investing in other projects that absorb carbon dioxide (CO2).

Increasing the use of fossil fuels is not a common method for reducing a country's carbon footprint.

Carbon footprint is a measure of the total amount of greenhouse gases emitted over a product's entire life cycle, from raw material extraction to disposal.

Expanding highways and roads is not a common method for reducing a city's carbon footprint.

Carbon Capture and Storage (CCS) is the practice of capturing carbon dioxide (CO2) from the atmosphere and storing it underground or in other geological formations.

Eating a plant-based diet is not a common method for reducing an individual's water footprint. While it can have a positive impact, other methods such as taking shorter showers, fixing leaky faucets, and watering the lawn less frequently are more widely recognized and effective.