Question

Describe three methods of land disposal that were used in the 1970 s. How has their use changed over time?

Short answer

The three methods of land disposal used in the 1970s were the landfill method, ocean dumping, and open burning. Over time, the use of these methods has changed, with landfill being engineered to control waste better and minimize environmental impact, ocean dumping largely discontinued to protect marine ecosystems, and open burning significantly diminished and regulated due to its contribution to global warming.

Step-by-step solution

Understand the methods of land disposal used in the 1970s

The primary methods of land disposal used during the 1970s include landfill method, ocean dumping, and open burning. These procedures were widely used due to their simplicity and cost-effectiveness.

Explain each method briefly

- Landfill Method: This approach involved dumping waste materials into a pit and then covering it with soil.- Ocean Dumping: As the name suggests, this manner of disposal involved dumping waste into the ocean.- Open Burning: This method involved combustion of wastes in open sites.

Illustrate how the usage of these methods has changed over time

Over time, due to environmental protection regulations and the detrimental effects of these methods on the environment and human health, their use has significantly decreased.- Landfill Method: Modern landfills are now engineered sites that contain waste in a controlled manner and minimize environmental impact.- Ocean Dumping: This method has largely been discontinued due to its harmful effects on marine ecosystems.- Open Burning: The use of open burning has significantly diminished due to the release of harmful gases which contribute to global warming, and it is now regulated by strict regulations.