he natural warming of the earth that results when gases in the atmosphere trap heat from the sun that would otherwise escape into space.
greenhouse effect
25
The greenhouse effect is a good thing. It warms the planet to its comfortable average of ??????????? degrees Fahrenheit (15 degrees Celsius) and keeps life on earth, well, livable.
59
20
Without greenhouse effect, the world would be a .............., uninhabitable place, more like Mars
frozen
20
when was greenhouse effect identified?
1896
15
Sunlight makes the earth ...............
habitable
20
Increased greenhouse means less ...................escape.
heat
10
Cars and trucks are responsible for more than 80 percent of ???-related carbon emissions.
transportation
15
Since the start of the Industrial ????, more than 2,000 billion tons of carbon dioxide have been released into the atmosphere by human activities
Revolution
15
....................occurs when carbon dioxide (CO2) and other air pollutants and greenhouse gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface.
global warming
20
In the United States, the burning of ......................... to make electricity is the largest source of heat-trapping pollution, producing about two billion tons of CO2 every year
fossil fuels
20
Melting ................. early snowmelt, and severe droughts will cause more dramatic water shortages and increase the risk of wildfires
glaciers
15
Rising ...................will lead to coastal flooding
sea levels
10
In recent years, ...................has taken the lead in global-warming pollution, producing about 28 percent of all CO2 emissions
China
10
...................comes in second in global warming pollution.
The USA
10
Every human being has to take..................against climate change.
precaution, action
15
The area without oxygen in the oceans is called ...............
