Since the beginning of the twentieth century,the rate at which CO₂,CH₄,and nitrogen oxides have been released into the atmosphere has outpaced the rate at which they can be recycled.Thus these _______ _______ are accumulating in Earth's atmosphere and are correlated with an increase in the global annual-mean surface air temperature.
or

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The Answer of Since the beginning of the twentieth century,the rate at which CO₂,CH₄,and nitrogen oxides have been released into the atmosphere has outpaced the rate at which they can be recycled.Thus these _______ _______ are accumulating in Earth's atmosphere and are correlated with an increase in the global annual-mean surface air temperature. or

Since the Beginning of the Twentieth Century,the Rate at Which