1
Sunlight that warms Earth is re-emitted as infrared radiation, which is absorbed by greenhouse gases and causes further warming.
Grade Level   K 1 2 3 4 5 6 7 8 9 10 11 12
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2
Current consumption of fossil fuel releases more than 25 billion tons of CO2 into the atmosphere every year. If current trends continue, there will be a tripling of atmospheric CO2 by the end of the century—levels not seen for more than 40 million years. By measuring our carbon footprint, we can...
Grade Level   4 5 6 7 8 9 10 11 12
Classroom Activities Curricula and Instruction
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