File Name: methane and global warming .zip
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Greenhouse gases GHGs warm the Earth by absorbing energy and slowing the rate at which the energy escapes to space; they act like a blanket insulating the Earth.
Human action is causing an increase in global temperature. For that reason, the greenhouse effect, far from being our great ally as was the case in the past, is now a risk to our survival. The flooding of coastal cities, the desertification of fertile areas, the melting of glacial masses and the proliferation of devastating hurricanes are just some of the main consequences. Global warming is having a profound impact on the processes of soil degradation and is contributing to the desertification of the most arid areas on the planet. The increase in the global temperature of the planet produces a rise in the level of the sea, which will cause the disappearance of islands and coastal cities. The greenhouse effect is a natural phenomenon and is beneficial for us.
Larger image to save or print Gases that trap heat in the atmosphere are called greenhouse gases. This section provides information on emissions and removals of the main greenhouse gases to and from the atmosphere. For more information on the other climate forcers, such as black carbon , please visit the Climate Change Indicators: Climate Forcing page. A million metric tons is equal to about 2. For comparison, a small car is likely to weigh a little more than 1 metric ton. Thus, a million metric tons is roughly the same mass as 1 million small cars! The U.
Obviously, human activities play a major role in increasing methane emissions from most of these sources. Especially the worldwide expansion of paddy rice cultivation, livestock production and fossil fuel exploration have increased the methane concentration in the atmosphere. Several data sets help estimate atmospheric methane concentration up to , years back. Major sources and sinks of present-day methane emission and their relative contribution to the global methane balance demonstrate great uncertainties in the identification and quantification of individual sources and sinks. Most recent methane projections of the Intergovernmental Panel on Climate Change IPCC for and are discussed and used to estimate the contribution of population growth to future methane emission. Finally the paper discusses options and restrictions of reducing anthropogenic methane emissions to the atmosphere.
Atmospheric methane is the methane present in Earth's atmosphere. Atmospheric methane is rising. The year global warming potential of methane is Early in the Earth's history carbon dioxide and methane likely produced a greenhouse effect. The carbon dioxide would have been produced by volcanoes and the methane by early microbes. During this time, Earth's earliest life appeared. Oxygen did not become a major part of the atmosphere until photosynthetic organisms evolved later in Earth's history.
Current Delegates View a list of delegates. Participate How to participate Join the mailing list. Methane CH 4 is a hydrocarbon that is the primary component of natural gas and a very potent and important greenhouse gas GHG. Unlike other GHGs, methane can be converted to usable energy. Capturing and using methane offers opportunities to generate new sources of clean energy and mitigate global climate change. Like emissions of other GHGs, emissions of methane due to human activities anthropogenic emissions have increased markedly since pre-industrial times. The global atmospheric concentration of methane has grown from a preindustrial value of about parts per billion ppb to 1, ppb in — a nearly percent rise and far above the natural range of the last , years.
To investigate which processes cause the current increase in atmospheric methane in the context of future interactions between climate change, the methane cycle and policy decisions. There is evidence for various contributors to emission increases or reduced removal of atmospheric methane. No single process can explain the methane rise and remain consistent with available data. Reconstructions of recent changes in the methane budget do not converge as to the dominant contributor to the rise. A plausible scenario includes increasing emissions from agriculture and fossil fuels while biomass burning is reduced, with possible contributions from wetlands and a weakened sink.
The livestock sector requires a significant amount of natural resources and has an important role in global greenhouse gas emissions. The most important greenhouse gases from animal agriculture are methane and nitrous oxide. Mitigation strategies aimed at reducing the emission intensity of this sector are needed to meet the increasing demand for livestock products driven by population growth. To increase the effectiveness of mitigation strategies, the complex interactions among the components of livestock production systems must be taken into account to avoid environmental trade-offs.
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