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Global warming potential (GWP) is a measure of how much heat a greenhouse gas traps in the atmosphere over a specific time period, relative to carbon dioxide (CO 2). [1]: 2232 It is expressed as a multiple of warming caused by the same mass of carbon dioxide (CO 2). Therefore, by definition CO 2 has a GWP of 1.
This is an accepted version of this page This is the latest accepted revision, reviewed on 6 March 2025. Gas in an atmosphere with certain absorption characteristics This article is about the physical properties of greenhouse gases. For how human activities are adding to greenhouse gases, see Greenhouse gas emissions. Greenhouse gases trap some of the heat that results when sunlight heats the ...
So, the principle that a larger greenhouse effect corresponds to a higher surface temperature, if everything else (i.e., the factors that determine ) is held fixed, is true as a matter of definition. Note that the greenhouse effect influences the temperature of the planet as a whole, in tandem with the planet's tendency to move toward radiative ...
A 2-fold increase in CO 2 content changes the wavelengths ranges only slightly, and so this derivative is approximately constant along such an increase. Thus, a 2-fold increase in CO 2 content will reduce the radiation emitted by Earth by approximately: ln(2)*5 W/m 2 = 3.4 W/m 2. More generally, an increase by a factor c/c 0 gives: ln(c/c 0)*5 ...
The carbon footprint explained Comparison of the carbon footprint of protein-rich foods [1]. A formal definition of carbon footprint is as follows: "A measure of the total amount of carbon dioxide (CO 2) and methane (CH 4) emissions of a defined population, system or activity, considering all relevant sources, sinks and storage within the spatial and temporal boundary of the population, system ...
Distribution of global greenhouse gas emissions based on type of greenhouse gas (data from 2014) Carbon dioxide (CO 2) is the dominant emitted greenhouse gas, while methane (CH 4) emissions almost have the same short-term impact. [5] Nitrous oxide (N 2 O) and fluorinated gases (F-gases) play a lesser role in comparison.
Radiative forcing is defined in the IPCC Sixth Assessment Report as follows: "The change in the net, downward minus upward, radiative flux (expressed in W/m 2) due to a change in an external driver of climate change, such as a change in the concentration of carbon dioxide (CO 2), the concentration of volcanic aerosols or the output of the Sun." [3]: 2245
The climate forcing, ΔF, also contains contributions from solar activity (+0.05 W/m 2), aerosols (−0.9 W/m 2), ozone (+0.35 W/m 2), and other smaller influences, which brings the total forcing over the Industrial Period to 2.2 W/m 2, according to the best estimate of the IPCC Fifth Assessment Report in 2014, with substantial uncertainty. [57]