EVERYDAY SCIENCE

Detailed explanation-1: -Human Activity Is the Cause of Increased Greenhouse Gas Concentrations. Over the last century, burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2). This increase happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2.

Detailed explanation-2: -Rising carbon dioxide concentrations will increase plant growth. More rapid leaf area development and more total leaf area could translate into more transpiration. Rising carbon dioxide concentrations will decrease leaf stomatal conductance to water vapor. This effect could reduce transpiration.

Detailed explanation-3: -With their abundance of plants, forests (like the Tongass National Forest in the U.S. state of Alaska) often absorb more carbon than they release. They continually take carbon out of the atmosphere through the process of photosynthesis.

Detailed explanation-4: -Plants use sunlight, carbon dioxide from the atmosphere, and water for photosynthesis to produce oxygen and carbohydrates that plants use for energy and growth. Rising levels of CO2 in the atmosphere drive an increase in plant photosynthesis-an effect known as the carbon fertilization effect.