Download Protecting Earth's Food Supply (Environment at Risk) by Christine Petersen PDF

By Christine Petersen

In surroundings in danger medical rules, thoughts, and methodologies in environmental technological know-how are explored and defined.

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EPA to oversee pesticide use. Pesticides must now be registered and, in most cases, tolerance levels are set to limit the amount of residue that can be left on food.

A chemical element found in some rocks and soils, it was identified in the thirteenth century and had long been recognized as a poison that can affect the nervous system and other organs. ) Despite the known risks, agricultural agencies encouraged the use of lead arsenate. Naively, some farmers assumed that if a little was good, a lot must be better. Fruit inspectors and health officials began to quietly confiscate produce covered with white dust—evidence of lead arsenate overspraying. After decades of use, a new pesticide replaced lead arsenate.

Early in that century Thomas Newcomen introduced the steam engine. In 1769 James Watt modified Newcomen’s design, making an engine that was much more powerful and efficient. The steam engine was first used to force water into mines, allowing metals to be extracted more quickly. Greater supplies of metal made it possible to build more machines, and coal provided an inexpensive fuel to run them. Watt’s steam engine was soon modified for use in factories. Before long, citizens of Europe, the United States, and other nations were able to purchase a wide variety of products and tools that simplified their lives.

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