生态足迹及生态承载力PPT.ppt

Ecological Footprint & Ecological Carrying Capacity
1
“We do not inherit the earth from our ancestors, we borrow it from our children”
Haida proverb
(with Kenyan, Chinese, & other Amerindian variants)
1、两个关键术语
生态足迹Ecological footprint
生态承载力Ecological carrying capacity
Population/Environment principles
I = P x A x T
Impact = Population * Affluence * Technology
(Ehrlich and Holdren)
—Affluence includes consumption, waste and pollution
—Technology includes systems of providing water, food, shelter, energy, etc.
Overpopulation occurs when:
—When people exceed the carrying capacity of an area.
—Too many people, at a given level of affluence and technology, deplete the resources that support life and economies, and
—When they introduce more wastes than the environment can handle.
2、What is the Ecological Footprint?
The Ecological Footprint measures how much nature we have, how much we use, and who uses it.
The ecological footprint is an environmental accounting tool that prehensive, yet as an indicator relatively simple and easy to understand
It shows us how much biologically productive land and water a population (an individual, anization, a city, a country, or all of humanity) requires to support current levels of consumption and waste production, using prevailing technology.
it translates data for the consumption of energy and material resources into the equivalent area of biologically productive habitat that would be required to offset their use
it reveals the relative environmental effect of lifestyle choices
What is the Ecological Footprint?
Bioproductive segments
18%
Biologically Productive Land
11%
Deserts, Ice Caps and Barren Land
67%
Low-Productivity
Ocean
4%
Biologically
Productive Ocean
22%
Measuring Footprints
Consider monly used item, such as a environmental textbook
measuring its ecological footprint would involve calculating the area of bio-productive land necessary to offset the energy and materials used to in its production, d