several ppb

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• brazil — /breuh zil /, n. brazilwood. [1350 1400; ME brasile < ML < It < Sp brasil, deriv. of brasa live coal (the wood being red in color) < Gmc; see BRAISE] * * * Brazil Introduction Brazil Background: Following three centuries under the rule of… …   Universalium

• Brazil — Brazilian /breuh zil yeuhn/, adj., n. /breuh zil /, n. a republic in South America. 164,511,366; 3,286,170 sq. mi. (8,511,180 sq. km). Cap.: Brasília. Portuguese and Spanish, Brasil. Official name, Federative Republic of Brazil. * * * Brazil… …   Universalium

• environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …   Universalium

• Greenhouse gas — Simple diagram of greenhouse effect. A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.[1] …   Wikipedia

• global warming — an increase in the earth s average atmospheric temperature that causes corresponding changes in climate and that may result from the greenhouse effect. [1975 80] * * * Potential increase in global average surface temperatures resulting from… …   Universalium

• Geology of Mars — Mars   Mars as seen by the Hubble Space Telescope Designations …   Wikipedia

• Mars — This article is about the planet. For other uses, see Mars (disambiguation) …   Wikipedia

• Benzene in soft drinks — is the occurrence of the carcinogenic (cancer causing) chemical benzene in certain soft drinks. This contamination is a public health concern and has caused significant outcry among environmental and health advocates. Benzene levels are regulated …   Wikipedia

• Water supply and sanitation in the United States — is provided by towns and cities, public utilities that span several jurisdictions and rural cooperatives. About 15 million Americans are served by their own wells. Public water supply and sanitation systems are regulated by state level regulatory …   Wikipedia

• Drinking water quality in the United States — is a source of concern about pollutants in certain localities. In 2006, 89.3 percent of the nation s community water systems were in compliance with all of more than 90 U.S. Environmental Protection Agency (EPA) standards.[1]:220 Most of the… …   Wikipedia

• Imidacloprid effects on bee population — Imidacloprid is a systemic insecticide produced by the chemical firm Bayer AG. In France it was sold under the name Gaucho and its use is highly controversial as it is believed to be responsible for high losses in bees. According to the National… …   Wikipedia