How do humans increase the amount of greenhouse gases?

https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions

I guess breathing in O2 and out CO2 is a contributor. I ever thought of that :)

For more important factors check the site Ms. Sue gave you.

Humans contribute to the increase of greenhouse gases in a variety of ways. Here are some primary activities:

1. Burning Fossil Fuels: The combustion of fossil fuels like coal, oil, and natural gas for energy production is the largest human-caused source of greenhouse gas emissions. When these fuels are burned, carbon dioxide (CO2) is released into the atmosphere.

2. Deforestation: Human activities, such as clearing forests for agriculture or urbanization, lead to deforestation. Trees absorb CO2 and act as carbon sinks. By reducing the number of trees, the capacity to capture and store carbon dioxide is decreased.

3. Industrial Processes: Certain industrial activities produce greenhouse gases. For instance, cement production emits CO2 during the chemical reaction that occurs when limestone and other materials are heated.

4. Agriculture: Agricultural practices also contribute to greenhouse gas emissions. Livestock (particularly cows and sheep) emit large amounts of methane (CH4), a potent greenhouse gas, during digestion. Additionally, the use of synthetic fertilizers releases nitrous oxide (N2O).

5. Waste Management: Improper waste management, particularly the decomposition of organic waste in landfills, creates methane emissions. Inefficient waste treatment and practices, such as open burning, also release greenhouse gases.

Addressing this problem requires understanding and taking steps to reduce these activities. Transitioning to cleaner and renewable energy sources, preserving and restoring forests, implementing sustainable agricultural practices, and improving waste management systems are some key strategies for mitigating greenhouse gas emissions.