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1) A. Fossils fuels combustion is a one way path because they are not renewable. They are limited in supply and will surely become depleted one day. The combustion of modern plant material on the other hand is a cycle because the materials needed for their production is always available in inexhaustible quantities.

1) B. When humans burn fossil fuels, the stored carbon is released into the atmosphere as carbon dioxide. The carbon is then free to cycle through the Earth and can upset the natural balance of the carbon available, changing the way that processes occur on Earth.

2. Changes in oil drilling and discovery technology can and will completely change the eventual results in the search for undiscovered resources. The controversy lies in the desire to eliminate oil from the world's energy mix in order to prevent a perceived but uncertain risk of global warming and the desire to encourage the use of alternative energy in order to reduce that risk, even though so far no alternative energy source other than natural gas, coal, and nuclear energy has been able to compete with oil economically.

3. The world's population is growing at an ever-increasing rate, which means we must utilize the resources present on our planet in order to sustain ourselves. Including the many other resources required, oil is required for the generation of energy and other uses. However, in order to sustain ourselves, we are also destroying the environment. Our behavior and exponentially increasing population is not stable; therefore, we must find alternative and renewable forms of energy to minimize damage caused by activities such as offshore drilling.

4. Natural resources such as oil that are as yet undiscovered are very difficult to predict or estimate; this creates huge uncertainty and large errors in even the most rigorous scientific efforts to predict future supply. Changes in oil drilling and discovery technology can and will completely change the eventual results in the search for undiscovered resources. The controversy lies in the desire to eliminate oil from the world's energy mix in order to prevent a perceived but uncertain risk of global warming and the desire to encourage the use of alternative energy in order to reduce that risk, even though so far no alternative energy source other than natural gas, coal, and nuclear energy has been able to compete with oil economically.

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