PCBs and the enviroment essays

PCB's and the enviroment essays Life is a precious element to a broad range of creatures. When a chemical toxin invades life's environment, we should all be concerned. Polychlorinated biphenyls (PCBs) are a group of chemical compounds that are invading and polluting the environment. They cause severe health problems in humans and affect many creatures in nature. Scientist found high PCB levels in two orca whales that washed up dead last February near the Strait of Juan de Fuca (Ko, 2002). The United States Environmental Protection Agency claims they are quick to act on all PCB discoveries, but it may be too late. There are some remedies to remove PCBs from the environment, but it doesn't take care of the entire problem. Polychlorinated biphenyls are a group of chemicals compounds that have no molecular breakdown. They were used by the industrial manufacturing industry between 1930-1970. They were primarily used as electrical insulators in transformers and other electrical equipment. They were also used in a variety of products such as: power saws, typewriters, cereal boxes, and bread wrappers (Heimlich, 2002). They were released into the environment during their use by smokestacks, leakage of old equipment, leaching from landfills, and other polluted sediments. In 1976 after growing concerns and findings of high levels of PCBs in the environment; Congress banned all uses including the processing and distribution of PCBs (U.S. Environmental Protection Agency [EPA], 2002). These chemicals have filtered into every aspect of the environment. It has seeped into the soil and been carried down streams into our oceans. The toxic effects of PCBs include the death of animals, low growth rate in plants, and severe health problems in humans (Heimlich, 2002). According to an EPA study that was completed in 1987; chronic exposure to PCBs can cause cancer (EPA, 2002). It can also affect the reproductive system, immune system, and the nervous system. Ther...

Curbs and Sidewalks

Curbs and Sidewalks Curbs and Sidewalks Curbs and Sidewalks By Maeve Maddox Rod poses the question: In Spanish the words curb and sidewalk are interchangeable. Is it the same in English?    In U.S. English, the word sidewalk refers to a paved footpath alongside a street or a road. The sidewalk is usually raised above the level of the road. The curb is a stone or concrete edging between the road and the sidewalk. In British usage, curb is spelled kerb. What Americans call a sidewalk, British speakers call the pavement. Merchants that Americans call street vendors or sidewalk vendors are called kerb-merchants or kerb-vendors by British speakers. Curious about the alleged lack of distinction between sidewalk and curb in Spanish, I looked the words up in my New World Spanish Dictionary and found the following: acera: sidewalk; Mexican banqueta encintado: curb (of a sidewalk) bordillo:curb borde de acera: curb Comments from Spanish speakers welcome. Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Vocabulary category, check our popular posts, or choose a related post below:100 Beautiful and Ugly WordsHow to Punctuate with â€Å"However†Capitalizing Titles of People and Groups