Reasons why scientist believe the global climate is in the state of Essay

Reasons why scientist believe the global climate is in the state of crisis - Essay Example Earth’s energy budget constitutes the shortwave radiation net flow into the earth from the sun and the long wave radiation out to space. The weather and climate experienced on Earth are determined by the amount and distribution of incoming radiation from the sun. For an equilibrium climate, outgoing long wave radiation (OLR) necessarily balances the incoming absorbed solar radiation (ASR). However, there is a great deal of fascinating atmosphere, ocean, and land phenomena that couple the two. Greenhouse gas warming is caused by a shift in this balance where OLR is reflected back to the surface by the atmosphere. This reflection is due to the presence of heat-trapping gases (greenhouse gases) in the atmosphere. These gases include: carbon dioxide, methane and nitrous oxide. Naturally this reflection helps maintain the life sustaining surface temperature of the earth. Human activities have however increased the concentration of these gases; specifically carbon dioxide. Carbon dioxide concentration in the atmosphere has been building up since the advent of the industrial revolution in the mid-1700s, mainly due to the burning of fossil fuels (coal, oil, and natural gas) and the cutting down of forests. Human activities have also increased the emissions of other greenhouse gases, such as methane, nitrous oxide, and halocarbons. Halocarbon emissions come from the release of certain manufactured chemicals to the atmosphere. Examples include chlorofluorocarbons (CFCs), which were used extensively in refrigeration and for other industrial processes before their presence in the atmosphere were found to cause stratospheric ozone depletion. Methane concentration has increased mainly as a result of agriculture; raising livestock (which produce methane in their digestive tracts); mining, transportation, and use of certain fossil fuels; sewage; and decomposing garbage in landfills. About 70%