The Environment

In the Book Thresholds:The Environment by Bill Harris, he talks about changes in the world. Harris talks about how the earth can be considered a single organism just like people and trees. He also talks about how earth can be independent too. The main thing Harris talks about that is changing the world is the collapse of fisheries all over the world, people destroying the primary food sources and iron.

According to Harris Collapse is “worm and his co-authors define collapse as being when a part of the ocean where a particular fish species once plentiful and fished from has hit about 10 percent of its natural original population” (24). This quote means that collapse is when the fish species has about 10% of its original population, showing that when there are only 10% left of natural fish population fish are at there collapse. This has a huge affect on the world because fish in the water are dying and if fish continue to die less food will go around the world to eat. A Hole in the World

Another way that the world is changing is that people are destroying their primary source of food. This means that people are getting rid of their own sources of food by destroying the world. According to Harris “While changes in our atmosphere . . . may well, in and of themselves, make much of the planet hostile to human life, at the same time we are destroying the primary source of our food” (22). This quote means that even though the earth's atmosphere is making the planet hostile to human life, humans are also causing problems to the earth. People are not using the right about of nutrients when people first came to the world nutrient use was better, but as it excelled things changed through the world such as, fertilizer growth, iron use. The human body needs iron people according to Harris “become lethargic, don't sleep well, become depressed and tired, often gain weight, and are vulnerable to a wide variety of diseases”. (22). This quote shows that without iron life itself will be harder to survive in.