This indicator measures the percentage change in nitrous oxide (N2O) emissions from 1990 levels. Nitrous oxide emissions are mainly from fossil fuel combustion, fertilizers, rainforest fires, and animal waste. Each year of data shows the percentage change to that year from 1990. The carbon dioxide emissions of a country are only an indicator of one greenhouse gas. For a more complete idea of how a country influences climate change, gases such as methane and nitrous oxide should be taken into account. This is particularly important in agricultural economies. Nitrous oxide is a powerful greenhouse gas, with an estimated atmospheric lifetime of 114 years, compared with 12 years for methane. The per kilogram global warming potential of nitrous oxide is nearly 310 times that of carbon dioxide within 100 years. (Source: http://databank.worldbank.org/data/reports.aspx?source=2&type=metadata&series=EN.ATM.NOXE.ZG)
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