15. Empirical evidence indicates that
changes in the earth’s cloud cover will clearly enhance the warming effects of carbon
dioxide.
the increase in carbon dioxide, over thousands of years, is clearly the cause of global
warming.
if global warming continues for another century, as most models forecast, the sea levels
will clearly rise substantially, imposing costs much larger than the cost of preventing the
warming.
the earth has warmed a little more than one degree Fahrenheit in the past century.
16. The current empirical evidence indicates that
changes in the earth’s cloud cover will clearly enhance the warming effects of carbon
dioxide.
the increase in carbon dioxide, over thousands of years, is definitely the cause of global
warming.
if global warming continues as most models predict, then in the next 100 years the sea
levels clearly will rise by more than 10 feet.
none of the above is true.
17. Between 2000 and 2013, the world added more than 100 billion tons of carbon to the atmosphere.
Between 1998 and 2013, the earth’s temperature
rose by approximately 3 degrees Fahrenheit.
rose by approximately 2 degrees Fahrenheit.
showed no significant change.
fell by 1.4 degrees Fahrenheit.
18. In the United States, between 2007 and 2012, carbon dioxide emissions fell by 12 percent, primarily
because of
fewer highway miles driven by cars and trucks.
expanded use of ethanol as the result of regulations imposed by the Environmental
Protection Agency.
an increase in the supply and lower prices of natural gas, leading to substitution of this
cleaner fuel for coal in the generation of electricity.
milder weather in the nation during the period, which reduced the energy demanded, and
fuel used for heating and cooling.
19. Which of the following most accurately reflects the pattern of changes in the earth’s temperature?
The earth’s temperature has risen by approximately 3 degrees Fahrenheit during the past
century and most of the increase has occurred since 2000.
The earth’s temperature has fallen by approximately 1.4 degrees Fahrenheit during the