18 terms

APES Chapter 19 Global Change

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Terms in this set (...)

What is a change in the world's chemical, biological, and physical properties?
global change
What is global climate change?
changes in the climate of earth
What one aspect of climate change that includes the warming of the oceans, land masses, and atmosphere of the Earth?
global warming
What occurs in the Greenhouse Effect?
heat is radiated from the earth's surface and trapped by gases in the atmosphere, helping to maintain the earth at a temperature that can support life.
Water vapor, carbon dioxide, methane, nitrous oxide, ozone and CFCs are __________ gases.
greenhouse
Carbon dioxide (from volcanic eruptions), methane (from decomposition), nitrous oxides (from denitrification), and water vapor are all
natural greenhouse gases
What are some anthropogenic (manmade) sources of greenhouse gases?
*burning of fossil fuels
*agricultural practices
*deforestation
*landfills
*industrial production- CFCs
David Keeling
Began measuring CO2 concentrations in 1958=> RISING trend
Observing changes in species compositions and performing chemical analyses of ice are ways to
measure past temperatures
What is the effect of warmer oceans?
Oceans warm and cannot contain as much CO2, and, as a result, RELEASE CO2 back into the ATMOSPHERE
What is the positive CO2 feedback loop?
*Higher temperatures SPEED UP rate of decomposition
*faster decomposition= MORE CO2 in atmosphere
*more CO2 in atmosphere, HIGHER temperatures
What is the negative CO2 feedback loop?
*increased CO2 leads to INCREASED plant growth
*plants take CO2 out of atmosphere DECREASING CO2
What are some consequences of global warming?
*melting of polar ice caps, glaciers and permafrost
*rising sea levels
*heat waves and cold spells
*change in precipitation patterns
*increase in storm intensity
*shift in ocean currents
What are some consequences of global warming for living organisms?
*change in growing seasons (agricultural)
*humans may have to relocate
*diseases could increase
*economic consequences
It is unclear how much
world temperatures will increase for a given change in green house gases.
Kyoto Protocol of 1997 was an agreement that all developed nations will reduce
their green house gas emissions by 5% by 2012
(developing nations=no emission limit)
carbon sequestration
taking CO2 out of atmosphere and storing carbon in agricultural soil, the deep ocean, spent coal mines and natural gas reserves
Scientists are looking at cost effective ways to capture
CO2 from the air, and from emission sources such as coal plants

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