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Disastrous fires may result from arson, accident or uncontrolled forest fire. Their impact may include lives lost, people evacuated and property damaged. Numerous fires, especially forest fires, occur in Canada every year; this article details the worst that have occurred throughout the country’s history.
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Floods are primarily caused by naturally occurring changes in the height of rivers, lakes and oceans. According to Public Safety Canada, floods are the most common natural hazard in the country and among the costliest. Historic floods have occurred across Canada, with many of the worst happening on major river systems that pass through populated areas. Scientists predict that flooding linked to the impacts of climate change will increase as the 21st century progresses, particularly in coastal areas of the country.
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Radiation fog forms most commonly as moist air is cooled below its dew point, ie, the critical temperature at which air can no longer hold all its water vapour.
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Macleans
Standing in the back of the room, Louise Comeau didn't even attempt to hide her anger.This article was originally published in Maclean's Magazine on November 24, 1997
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Humidity is related to the amount of moisture or water vapour in the air. Although invisible, water vapour is always present in the atmosphere.
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Indian Summer, popular expression for a period of mild, summerlike weather which occurs in the autumn, usually after the first frost. The origins of the name are obscure, but it was in use early in the 19th century in Canada and even earlier in the US.
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Macleans
Albertas energy minister, Steve West, spent much of last week wearing a tight smile, his clenched jaw and square shoulders set as firmly as his conviction that people who blame the oilpatch for the next centurys foul weather have lost their heads.This article was originally published in Maclean's Magazine on December 22, 1997
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January thaw, or bonspiel thaw as it is called on the Prairies, is a climatic phenomenon of unseasonably warm weather that tends to occur at about the same time every year, usually within about 10 days after the middle of January.
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Macleans
In Alberta political circles, Lorne Taylor is sometimes referred to as the "egghead redneck." It is a mark of the man that Taylor, who is Alberta's environment minister and who holds a Ph.D. in educational psychology, takes more umbrage at the first half of that moniker than the latter.This article was originally published in Maclean's Magazine on October 14, 2002
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La Niña describes an extensive cooling of the waters in the tropical eastern Pacific Ocean. To qualify as a full-fledged La Niña, the cooling must persist for at least 3 seasons. La Niña events are cyclical, recurring every 3 to 5 years, but the interval can vary from 2 to 10 years.
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Macleans
The oldtimers call it a "capelin squall" - a mixture of bone-chilling winds, rain and fog that typically hammers the NEWFOUNDLAND coast in late June just as the capelin are coming inshore to spawn.This article was originally published in Maclean's Magazine on July 7, 1997
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Permafrost is ground remaining at or below 0°C continuously for at least two years. About 50 per cent of Canada is underlain by permafrost, mainly in the Arctic Archipelago, Yukon, Northwest Territories and Nunavut.
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Pollution can be defined as the release of any material, energy or organism that may cause immediate or long-term harmful effects to the natural ENVIRONMENT. Pollution was viewed initially as the unsightly mess or visible environmental damage resulting from careless disposal of various materials.
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Pondweed is a common name for members of the family Potamogetonaceae [Gk potamos, "river"], which consists of the genus Potamogeton.
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Central US lows, entering Canada somewhere between Manitoba and Québec, are of major environmental significance because they pass through the industrial heartland of the US and frequently bring ACID RAIN.
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