Since records began in 1958,the carbon dioxide concentration in the atmosphere has decreased.
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Q53: The average temperature on Earth has increased
Q54: Permafrost is permanently frozen ground.
Q55: Poorer nations are less vulnerable to the
Q56: There are no natural sources of CFCs.
Q57: The pH of the ocean has decreased
Q59: Global warming and climate change are the
Q60: Carbon dioxide is the most abundant greenhouse
Q61: Melting of Arctic sea ice is influencing
Q62: Geologic studies have shown that the earth's
Q63: Scientists have agreed that human activity is
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