Atmospheric methane (CH4) increased through much of the twentieth century, but this trend gradually weakened until a stable state was temporarily reached around the turn of the millennium, after which levels increased once more. The reasons for the slowdown are incompletely understood, with past work identifying changes in fossil fuel, wetland and agricultural sources and hydroxyl (OH) sinks as important causal factors. Here we show that the late-twentieth-century changes in the CH4 growth rates are best explained by reduced microbial sources in the Northern Hemisphere.

The previously increasing atmospheric methane concentration has inexplicably stalled over the past three decades. This may be due to a fall in fossil-fuel emissions or to farming practices that are curtailing microbial sources.

This article reports the greenhouse gas emissions of anthropogenic origin by sources and removals by sinks of India for 2007 prepared under the aegis of the Indian Network for Climate Change Assessment (INCCA) (note 1). The emission profile includes carbon dioxide (CO2), methane and nitrous oxide. 

 

Earth’s climate is warming as a result of anthropogenic emissions of greenhouse gases, particularly carbon dioxide (CO2) from fossil fuel combustion. Anthropogenic emissions of non-CO2 greenhouse gases, such as methane, nitrous oxide and ozone-depleting substances (largely from sources other than fossil fuels), also contribute significantly to warming. Some non-CO2 greenhouse gases have much shorter lifetimes than CO2, so reducing their emissions offers an additional opportunity to lessen future climate change.

An early-morning explosion deep in a coal mine in Ukraine on Friday killed 17 miners and left 9 others missing in a nation where poor maintenance and lax safety regulation make mining a perilous pr

There have been many studies on the effects of enriched levels of atmospheric carbon dioxide on soils. A meta-analysis shows that emissions of other greenhouse gases increase under high-CO2 conditions.

http://www.nature.com/nature/journal/v475/n7355/full/475177a.html

The accelerating dash for natural gas risks a bitter backlash as the environmental cost of exploiting new shale deposits and of transporting it in liquid form spoil its credentials as the greenest fossil fuel.

Gas was long regarded as a "bridging fuel" for use in relatively easily-to-build, gas-fired power plants, until enough renewable or low-emission nuclear power could be achieved.

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Wetlands, forests and farmlands soak up large amounts of carbon dioxide but rising amounts of the gas in the atmosphere mean these carbon "sinks" could become less effective at fighting climate change.

Scientists say land ecosystems are an essential brake on the pace of climate change because plants soak up large amounts of carbon dioxide (CO2) as they grow.

Increasing concentrations of atmospheric carbon dioxide (CO2) can affect biotic and abiotic conditions in soil, such as microbial activity and water content. In turn, these changes might be expected to alter the production and consumption of the important greenhouse gases nitrous oxide (N2O) and methane (CH4). However, studies on fluxes of N2O and CH4 from soil under increased atmospheric CO2 have not been quantitatively synthesized.

Dry roughages, viz. wheat straw (WS), rice straw (RS), barley straw (BS), oat straw (OS), gram straw (GS), lentil straw (LS), sorghum stover (SST), pearl millet stover (PMST), maize stover (MST) and dry mixed grass (DG) fed to livestock were characterized for carbohydrate and protein fractions, energy, in vitro dry matter digestibility (IVDMD) and in vitro methane (CH4) emission in buffalo inoculums with the objective to rank dry roughages for CH4 emission, and to correlate their nutritional constituents with CH4 production.

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