URPN 460 Chapter 7 study set

If a population of bacteria in a Petri dish doubles every 120 minutes, and it begins to double at noon on Monday, and is completely full on Tuesday at noon (and thereby crashes because it has no food and is overrun with it own waste), at what time was the Petri dish half full?

10:00 am Tuesday

If we replaced the use of oil with solar energy using existing technology, without disrupting agriculture production, forestry or the environment what proportion of the energy demand associated with oil can be met by solar energy?

20 to 50 percent

In the discussion of "Conundrun, which of the followings are true?

Advances in energy efficiency lower the cost of a given activity, which causes people to engage in that activity more. b. The author wants to impose energy frugality by increasing fuel taxes and capping consumption . c. Most sustainable prouducts and eco-living strategies are relevant the real problems better.

Accroding students' presentation of "Enough", since the time of the Green Revolution, the world has known how to end famine, yet many people die of hunger, malnutrition, and related diseases in Africa. Why?

Food aid from US undermines local markets and local farmers. Better planting regimens is not enough. Food aid alone was not enough

What are the key differences between a full-world and an empty-world? all answers 4 of 4 points

In a full world, resources, especially non-renewable ones, are the limiting factor, which is exacerbated by increased population growth and per capita production. A full world is characterized by high resource use and limited resource availability. In an empty world, human populations and resource use are quite low in comparison to resource availability such that it makes sense to ignore limits to growth and concentrate on developing systems that efficiently allocate labor, capital and consumer goods.

Accourding to Daly and Farley, why are exhausted species unlikely to be replaced by others in the long run?

We run the risk of exhausting the resource before we even have enough data to estimate sustainable yields b. Some countries fail to instigate limits on fishing. c. International agreements are hard to enforce. d. The declines often involve habitat destruction that is even slower to repair and impact many species simultaneously e. When a specie is near exhaustion, too many boats are after too few fish, if new replacements are found the problem only shifts to the new specie

Water is one of the more threatening of the imminent resource shortages 6 of 7 points

a. while climate change may increase rainfall, evaporation will dry it out faster too. b. Even though hydrological cycle renews water, global consumption of water has tripled in the last 50 years. c. Humans are pumping rivers dry and mining aquifers faster than it can be replenished. d. The Ogallala aquifer has turned the arid western U.S. into a breadbasket, but is now seriously depleted and tens of thousands of acres are expected to loose irrigation over the next 20 years at the present rate of depletion. e. Rainfall is expected to remain stable in terms of where it falls in light of climate change. f. Projections about water are very clear and certain as adequate data has been a priority. g. Because 70% of water is used for agriculture, food shortages will be impacted by water shortages.

A common rule of thumb with respect to exponential growth rates states that

dividing 72 by the growth rate results in the doubling time

Actually the world is always full of some things and empty of others. In a empty world what is the world full of

renewable resources fossil fuels mineral resources fresh water

According to Daly and Farley, which of the following are the primary sources of limits to extraction rates with respect to renewable resources?

scarcity

According to the lecture on a Houston watershed, Dr. Rogers focused on 4 of 5 points

showed that the average flow is getting larger the relationship between increased flow and development One watershed in Harris County the role of roads in contributing to development and increased watershed flow