b. Environmental problems such as air and water pollution are causing natural resources like fossil fuels and lumber sources to disappear.
The most powerful States, specifically Canada and the United States, are competing because of the decline in the sources of fossil fuel and increase in the energy demands.
The countries are trying hard to preserve and secure the nonrenewable sources around the world which are on the verge of depletion. Not only the overuse of the resources is responsible for their extinction, but the harmful effects of the pollution is adding into the problem.
However eforts are being made by the United States and Canada to manage and enhance their energy security by using renewable energy sources.
Answer:
A. by looking for changes in the response pattern from pre to post-treatment
"Utility" would be the best option for "the level of satisfaction a need or want provides" in the realm of economics, since a person "utilizes" something in order to get this satisfaction.
It might be said that people migrate from rural to urban areas. This kind of migration is known as interregional migrations and it might be produced because of jobs opportunities and environment issues. This kind of migration could be found in countries such us Russia (people migrate to the North), Canada (from east to west) and China (from Rio to Brazilia)
