Pollutants Carbon Dioxide (CO2)

Description:
CO₂ is an odorless, colorless gas that occurs naturally in the atmosphere at about 0.036% or 360 ppm. Carbon Dioxide is about 1.5 times denser than air. CO₂ is thought of as a greenhouse gas in the upper atmosphere because it traps incoming heat from the sun and outgoing heat from the earth. This greenhouse effect is what keeps our planet warm and comfortable enough for life, but human activity has increased the concentration of this gas in the atmosphere far above its natural level, and the result is global warming.

Source:
CO₂ is created by both natural and man-made sources. Our bodies create CO₂ continually. As we breathe in, oxygen travels through our bodies and, through chemical reactions in our cells, is exhaled in the form of CO₂. Plants use CO₂ during photosynthesis to create carbohydrates from carbon dioxide, water, and energy from sunlight. This process helps them grow. Yet, as with all components of our ecosystem, a delicate balance of CO₂ is necessary for a healthy environment.

Man-made processes are increasing CO₂ levels. When any carbon-based fuel (such as wood, coal, petroleum, or natural gas) is burned in the presence of oxygen, carbon dioxide will be emitted. CO₂ levels are also increased when we deplete tree habitats for new developments.