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Main sources of global methane emissions (2008-2017) according to the Global Carbon Project [ 40] Methane emissions come from livestock, manure, rice cultivation, landfills, wastewater, and coal mining, as well as oil and gas extraction. [ 41] Nitrous oxide emissions largely come from the microbial decomposition of fertiliser.
Human activities — for instance, the way we heat our homes, power our air conditioners, fuel our cars and produce our food — all contribute to greenhouse gas emissions, which causes the ...
Op-ed. An op-ed piece is a short newspaper column that represents a writer's strong, informed, and focused opinion on an issue of relevance to a targeted audience. It is a written prose piece that expresses the opinion of an author or entity with no affiliation with the publication's editorial board. [ 1] The term is short for "opposite the ...
t. e. Air pollution is the contamination of air due to the presence of substances called pollutants in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. [ 1] It is also the contamination of the indoor or outdoor environment either by chemical, physical, or biological ...
Periodontal disease, also known as gum disease, is a set of inflammatory conditions affecting the tissues surrounding the teeth. [ 5] In its early stage, called gingivitis, the gums become swollen and red and may bleed. [ 5] It is considered the main cause of tooth loss for adults worldwide. [ 7][ 8] In its more serious form, called ...
e. In the economics study of the public sector, economic and social development is the process by which the economic well-being and quality of life of a nation, region, local community, or an individual are improved according to targeted goals and objectives. The term has been used frequently in the 20th and 21st centuries, but the concept has ...
The following is a sampling of some of the definitions of ethnomathematics proposed between 1985 and 2006: "The mathematics which is practiced among identifiable cultural groups such as national-tribe societies, labour groups, children of certain age brackets and professional classes". [5] "The mathematics implicit in each practice". [6]
Hydrocarbon. Ball-and-stick model of the methane molecule, CH 4. Methane is part of a homologous series known as the alkanes, which contain single bonds only. In organic chemistry, a hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. [ 1]: 620 Hydrocarbons are examples of group 14 hydrides.