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Environmental Health

  • Gary Braasch: Earth Under Fire Featured Photo Gallery Gary Braasch: Earth Under Fire Gary Braasch: Earth Under Fire

    Gary Braasch is an environmental photographer and writer. He covers natural history and conservation issues for magazines worldwide. In recent years photographs and articles of... More »

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Focus: Impacts of Humans and Their Economy on the Environment Last Updated on 2009-02-27 21:45:49 The National Science Foundation (NSF) has issued a Dear Colleague Letter to the scientific community ". . . encouraging increased research . . . on the links among environment, society and the economy." Image Above: NSF is supporting research on climate change and Earth's environment, society and economy. Credit: Department of Sustainability and Environment, State of Victoria, Australia More »
Gary Braasch: Earth Under Fire Last Updated on 2008-09-12 10:40:01 Gary Braasch is an environmental photographer and writer. He covers natural history and conservation issues for magazines worldwide. In recent years photographs and articles of his appeared in Time, LIFE, Discover, Nature, Science, Audubon, National Wildlife, Smithsonian, Natural History, Animals, French Terre Sauvage, Outdoor Photographer, Photo District News and the Swiss Animan magazine. He is a winner of the Ansel Adams award for conservation photography and a Fellow of the International League of Conservation Photographers. Braasch exhibited a 30 print show on climate change entitled Polar Thaw at the American Association for the Advancement of Science in Washington DC, the Science Museum of Minnesota, the Field Museum in Chicago and many universities.  The United Nations published his photographs as calendars, in magazines, and a set of international stamps about global... More »
DDT Last Updated on 2008-09-03 00:00:00 DDT is the abbreviation for the chemical 1,1,1-trichloro-2,2-bis-(p-chlorophenyl) ethane. DDT is used as an insecticide. It has the appearance of colorless needles or of a white to slightly off-white powder. It is insoluble in water and is slightly soluble in alcohol. Since it had not been shown to be particularly lethal to humans, it was used extensively in Word War II to reduce and manage mosquito populations and to control malaria for the protection of U.S. troops. Also, it was used on civilian populations in Europe to prevent the spread of lice and the diseases they carried. DDT became popular as the first modern pesticide, hailed as a miraculous advance in pest control. Its developer, Paul Müller of Switzerland, won the Nobel Prize in 1948). Peak usage in the U.S. occurred in 1962 when about 80 million kilograms of DDT were used of about 82 million kilograms produced. Although it... More »
Health Effects of the Chernobyl Accident Last Updated on 2008-07-24 00:00:00 April 26, 2006, was the 20th anniversary of the Chernobyl accident, the second major single exposure to radiation of a substantial population. The accident produced a significant international response whose effectiveness is the subject of debate. It is relevant to the current view of the consequences of Chernobyl to reflect on the understanding in 1965 of the health consequences of the first major event, radiation from the atomic bombs in Hiroshima and Nagasaki, Japan, in 1945. The only significant consequences observed in survivors 20 years after the atomic bombs were increases in leukemia and thyroid cancer, and the general view of the future was reassuring. In 1974, a significant increase in solid cancers was detected, and nearly 50 years after the event, an unexpected increase was found in non-cancer diseases. Today, leukemia and thyroid cancer form only a small fraction of the... More »
Malaria Last Updated on 2008-07-16 00:00:00 Mature Plasmodium vivax schizont containing 18 merozoites. The malaria parasite life cycle involves two hosts; during a blood meal, a malaria-infected female Anopheles mosquito inoculates sporozoites into the human host, which infect the liver, mature into tissue schizonts, and rupture releasing merozoites which in turn infect red blood cells. Those red blood parasites mature into blood schizonts (shown here). (Source: CDC; Credit Dr. Mae Melvin) Malaria is a mosquito-borne disease caused by a parasite. Each year 350-500 million cases of malaria occur worldwide, and over one million people die, most of them young children in sub-Saharan Africa. Malaria is widespread in tropical and subtropical regions, including parts of the Americas, Asia, and sub-Saharan Africa. Malaria is caused by a protozoan parasite of the genus Plasmodium and is transmitted to animals by the bite of a... More »