Environment Stats: compare key data on United States & Western Sahara

Current issues: This entry lists the most pressing and important environmental problems. The following terms and abbreviations are used throughout the entry:
International agreements > Signed but not ratified: The various international environmental agreements which a country has signed but not ratified. Agreements are listed in alphabetical order by the abbreviated form of the full name.
Pollution > Carbon dioxide 1999: 1999 total CO2 emissions from fossil-fuel burning, cement production, and gas flaring. Emissions are expressed in thousand metric tons of carbon (not CO2).
Proportion of land and marine area under protection: Terrestrial and marine areas protected to total territorial area, percentage.
Proportion of land area under protection: Terrestrial areas protected to total surface area, percentage.
Water > Proportion of marine area under protection: Marine areas protected to territorial waters, percentage.

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STAT	United States	Western Sahara
Current issues	air pollution resulting in acid rain in both the US and Canada; the US is the largest single emitter of carbon dioxide from the burning of fossil fuels; water pollution from runoff of pesticides and fertilizers; limited natural fresh water resources in much of the western part of the country require careful management; desertification	sparse water and lack of arable land
International agreements > Signed but not ratified	Air Pollution-Persistent Organic Pollutants, Air Pollution-Volatile Organic Compounds, Biodiversity, Climate Change-Kyoto Protocol, Hazardous Wastes	none of the selected agreements
Pollution > Carbon dioxide 1999	1.5 million Ranked 1st. 23075 times more than Western Sahara	65 Ranked 175th.
Proportion of land and marine area under protection	15.14% Ranked 83th. 2 times more than Western Sahara	6.71% Ranked 132nd.
Proportion of land area under protection	13.82% Ranked 111th. 2 times more than Western Sahara	5.77% Ranked 160th.
Water > Proportion of marine area under protection	30.4% Ranked 19th. 67% more than Western Sahara	18.23% Ranked 32nd.

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