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Emission intensity is a ratio between greenhouse gas emissions and another metric, e.g., gross domestic product (GDP) or energy use. The terms "carbon intensity" and "emissions intensity" are also sometimes used. [63] Emission intensities may be calculated using market exchange rates (MER) or purchasing power parity (PPP). [56]: 96
This is an accepted version of this page This is the latest accepted revision, reviewed on 24 January 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 ...
Emission (radiocommunications), a radio signal (usually modulated) emitted from a radio transmitter Emission coefficient , a coefficient in the power output per unit time of an electromagnetic source Emission line , or "spectral line", a dark or bright line in an otherwise uniform and continuous spectrum
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 ...
There is an important difference between air pollution emissions and exposure. [99] Emissions are the quantity of pollutants released from a particular source; exposure is the quantity of a pollutant breathed in by people or other living things.
The data only consider carbon dioxide emissions from the burning of fossil fuels and cement manufacture, but not emissions from land use, land-use change and forestry [n 2] Over the last 150 years, estimated cumulative emissions from land use and land-use change represent approximately one-third of total cumulative anthropogenic CO 2 emissions. [6]
Global net-zero emissions describe the state where emissions of greenhouse gases due to human activities and removals of these gases are in balance over a given period. It is often called simply net zero. [2] In some cases, emissions refers to emissions of all greenhouse gases, and in others it refers only to emissions of carbon dioxide (CO 2). [2]
Carbon sinks (green bars on the right) remove carbon from the atmosphere, whereas carbon sources (greenhouse gas emissions) (grey bars on the left) add them.Since the 1850s, there are more carbon sources than sinks and therefore the carbon dioxide in Earth's atmosphere is rising.