The increase in the natural greenhouse effect resulting from increases in atmospheric concentrations of GHGs due to emissions from human activities.
The natural greenhouse effect has been enhanced by anthropogenic emissions of greenhouse gases. Increased concentrations of carbon dioxide, methane, and nitrous oxide, CFCs, HFCs, PFCs, SF6, NF3, and other photochemically important gases caused by human activities such as fossil fuel consumption and adding waste to landfills, trap more infra-red radiation, thereby exerting a warming influence on the climate. See Climate Change and Global Warming.
refers to the expected rise in the earth's temperature due to an increase in greenhouse gas concentrations from human activity.
Human actions - such as burning fossil fuels and land clearing - are increasing the concentration of greenhouse gases in the atmosphere, resulting in an increase in the heat trapped. This is called the enhanced greenhouse effect. The major consequence of this is an increase in temperature on the Earth's surface resulting in weather and climate changes.
the increase in the strength of the natural greenhouse effect, resulting from human activities that release additional quantities of greenhouse gases into the atmosphere.
The concept that the natural greenhouse effect has been augmented by emissions of man-made greenhouse gases. Increased concentrations of carbon dioxide, methane, nitrous oxide, CFCs, HFCs, PFCs, SF6, NF3 and other photochemically important gases caused by human activities trap more infrared radiation, thereby exerting a warming influence on the climate.
See definition for "greenhouse effect" below Today, humankind is contributing significant amounts of heat-trapping gases to the atmosphere. The increased concentrations of these gases are adding to the natural greenhouse effect. It is the "enhanced greenhouse effect" that is expected to cause a large and rapid rise in average global temperatures.
An increase in the natural process of the greenhouse effect, brought about by human activities, whereby greenhouse gases such as carbon dioxide, methane, chlorofluorocarbons and nitrous oxide are being released into the atmosphere at a far greater rate than would occur through natural processes and thus their concentrations are increasing. Also called anthropogenic greenhouse effect or climate change.
the addition to the natural greenhouse effect resulting from human activities such as the burning of fossil fuels and land clearing, which increase the atmospheric levels of greenhouse gases such as carbon dioxide, methane, nitrous oxide, ozone and CFCs ( see also greenhouse effect)
The additional absorption of solar radiation caused by the increased concentrations of greenhouse gases in the atmosphere due to human activities over the past two centuries. It is over and above the radiation absorbed by the atmosphere in pre-industrial times (the greenhouse effect), that is essential for life on earth.
greenhouse effect made greater by human activities, such as burning fossil fuels and clearing land, that add greenhouse gases to the atmosphere
The additional greenhouse effect due to an increase in the concentration of greenhouse gases. Because of the complexity of the feedback processes within the climate system, the enhanced greenhouse effect is usually referred to in terms of the radiative forcing that results at the tropopause, after the stratosphere has come into a new radiative equilibrium. For example, thus defined, the enhanced greenhouse effect due to an effective doubling of carbon dioxide concentration from its preindustrial baseline is about 4 W m−2. Note the difference in meaning from the greenhouse effect, which refers to the entire natural process and which results in a climatological average counterradiation of about 330 W m−2 to the surface. A comparable value for the enhanced greenhouse effect at the surface will only be obtained once the new equilibrium temperature of the surface is known, since they are strongly interrelated.