EARTH SCIENCE
CLIMATE AND ENVIRONMENTAL CHANGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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No one knew what the greenhouse effect was 100 years ago
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the earth has moved closer to the sun in the last 100 years
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humans have been creating large amounts of greenhouse gases in the last 100 years
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None of the above
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Detailed explanation-1: -To predict future climate, scientists use computer programs called climate models to understand how our planet is changing. Climate models work like a laboratory in a computer. They allow scientists to study how different factors interact to influence a region’s climate.
Detailed explanation-2: -The main influences on our temperatures over the last 100 years include: increases in atmospheric carbon dioxide and other greenhouse gases. changes to land cover (replacement of darker forests with paler croplands and grasslands) solar fluctuations (small effect caused by changes in the brightness of the Sun)
Detailed explanation-3: -Since 1880, average global temperatures have increased by about 1 degrees Celsius (1.7° degrees Fahrenheit). Global temperature is projected to warm by about 1.5 degrees Celsius (2.7° degrees Fahrenheit) by 2050 and 2-4 degrees Celsius (3.6-7.2 degrees Fahrenheit) by 2100.
Detailed explanation-4: -A: Scientists agree that the earth’s rising temperatures are fueling longer and hotter heat waves, more frequent droughts, heavier rainfall, and more powerful hurricanes.