Why the increasing concentration of greenhouse gases like CO2 and methane is a serious problem?
Answers
Explanation:
because it causes global warming
Although the process is complex, the greenhouse effect can be described fairly simply:
Sunlight passes through the atmosphere. Clouds, ice caps and other light-colored surfaces reflect some light back into space, but most of the incoming energy reaches the planet’s surface. The Earth radiates heat back toward space. Greenhouse gases in the atmosphere absorb that heat, bouncing some back to the Earth’s surface and releasing some into the atmosphere.
Greenhouse Effect - Source: Will Elder, National Park Service
Greater concentrations of greenhouse gases mean more solar radiation is trapped within the Earth’s atmosphere, making temperatures rise. Source: W. Elder, NPS.
What are Greenhouse Gases?
Greenhouse gases include carbon dioxide, methane, nitrous oxide and other gases that accumulate in the atmosphere and create the heat-reflective layer that keeps the Earth at a livable temperature. These gases form the insulation that keeps the planet warm enough to support life.
Some of the most common — and worrisome — greenhouse gases are:
Carbon dioxide, which is emitted whenever coal, oil, natural gas and other carbon-rich fossil fuels are burned. Although carbon dioxide is not the most powerful greenhouse gas, it is the largest contributor to climate change because it is so common. In order to reduce carbon dioxide emissions, we need to reduce the amount of fuel we use in our cars, homes, and lives.
Methane is caused by the decomposition of plant matter, and is released from landfills, swamps, rice paddies. Cattle also release methane. Although methane emissions are lower than carbon dioxide emissions, it is considered a major greenhouse gas because each methane molecule has 25 times the global warming potential of a carbon dioxide molecule.
Nitrous oxide is released from bacteria in soil. Modern agricultural practices — tilling and soil cultivation, livestock waste management, and the use of nitrogen-rich fertilizers — contribute significantly to nitrous oxide emissions. A single nitrous oxide molecule has 298 times the global warming potential of a carbon dioxide molecule.
Additional greenhouse gases include hydrofluorocarbons (1,430-14,800 time the global warming potential of carbon dioxide), sulfur hexafluoride (22,800 times the global warming potential of carbon dioxide), and water vapor.
Learn more about “climate forcing” greenhouse gases.
GHGases
Of the twenty greenhouse gases, carbon dioxide accounts for by far the largest share of radiative forcing since 1990, and its contribution continues to grow at a steady rate. Source: US EPA.