(共38张PPT)
Facts
about
global
warming ·The temperature of the earth rose about (1)________
Fahrenheit during the 20th century.
·The global warming is caused by (2)_____________ rather than a random but natural phenomenon.
Views on
global
warming Janice
Foster ·Small amounts of gases in the atmosphere (3)_____ heat from the sun and therefore warm the earth.
·We need the gases because without them the earth would be about thirty three degrees Celsius (4)______ than it is.
·If we add huge (5)___________ extra carbon dioxide into the atmosphere by burning fossil fuels, it will cause the (6)_______________ to go up.
Views on
global
warming Janice
Foster ·Over the next 100 years the amount of warming could be as low as 1 to 1.5 degrees Celsius, but it could be as high as 5 degrees.
·An increase of 5 degrees in the temperature would be a(n) (7)__________.
Charles
Keeling From 1957 to 1997, the carbon dioxide in the atmosphere went up from about 315 parts to about 370 parts per million.
George
Hambley ·We shouldn’ t worry about (8)__________ of carbon dioxide in the air.
·Any warming will be mild with
few bad environmental (9)____________.
·More carbon dioxide is actually a(n)
(10)________ thing.
“课时跟踪检测”见“Unit 4 课时跟踪检测(一)”
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