Increased atmospheric concentration of this greenhouse gas has this effect on ocean chemistry.
What is CO2 causing ocean acidification?
100
This is the year when mass produced automobiles were first available.
When is 1908?
100
Portable energy has had this quality for most of human history.
What is embodied (in mass)?
100
In the ancient world, this unit of value represented 130 grains of barley.
What is a shekel?
100
This group includes hundreds of scientists from dozens of countries who review and summarize all recent journal articles on climate change, for the UN.
What is the IPCC (Intergovernmental Panel on Climate Change)?
200
Current atmospheric CO2 concentrations exceed the level considered safe by climate scientists, by this amount.
What is 50 parts per million? (350 ppm is considered the maximum safe level for CO2; current concentrations of 400 ppm are too high.)
200
This method of farming was the same in the ancient world and in 19th century North America.
What is the ox-driven plow?
200
This country is rapidly building its renewable power infrastructure as well as its coal plants.
What is China?
200
Before industrialization, animals were valued primarily for these two reasons.
What are for food, and for their strength?
200
This qualitative rate describes global population growth.
What is a DECREASING global population growth rate?
300
This chemical forms the crystal structure of both agates and photovoltaic solar cells.
What is silicon dioxide (SiO2)?
300
This was the approximate number of automobiles in the U.S. in 1900, according to the U.S. Census.
What is 5000?
300
This term describes the flow of energy production, and the rate of use of energy.
What is power?
300
This value may need to outweigh economical savings, for composting toilets to become more widely used.
What is ecology?
300
This international treaty from 1992 would commit countries to reducing their greenhouse gas emissions.
What is the Kyoto Protocol?
400
These two primary climate factors contribute to stronger storms.
What are greater warmth (in oceans and atmosphere) and higher humidity (water vapor concentration in the atmosphere).
400
Garages on houses evolved from this original function.
What is shelter for the farm animals of the household.
400
This fuel produces about half as much carbon per unit energy as does coal burning.
What is natural gas (or methane)?
400
DAILY DOUBLE! This ICAT factor produces the greatest growth in carbon emissions.
What is Affluence?
400
This amount of CO2 is created by driving one mile in an automobile, on average.
What is 1 pound of CO2? (Burning one gallon of gasoline creates about 20 pounds of CO2.)
500
DAILY DOUBLE: This feedback mechanism makes global warming drive local cooling, by altering this weather pattern.
What is ice albedo feedback warming the arctic, weakening the jet stream and strengthening the polar vortex?
500
Artist Winslow Homer depicted the New Year arriving in 1868 like this.
What is on a velocipede?
500
As the energy density of fuel increases, the relative amount of carbon to this element decreases.
What is Hydrogen?
500
According to Mike Hulme, the answer is that people have different understandings, values, beliefs, fears, interpretations of risk, and priorities.
Why do we disagree about climate change?
500
Before the internet, these technologies helped create communities between people, even though could not see each other face to face.
What are communication technologies (newspapers, radio, television, telegraph)?