Is Earth’s atmosphere changing?
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In the past hundred years or so, human population growth and industrial activity has caused a much sharper change in the concentrations of some gases and particulates on a much shorter timescale than at any time in the past 200,000 years. The most dramatic effect has been a huge increase in the amount of carbon dioxide in the atmosphere. Scientific research has shown that this increase has contributed to Earth’s greenhouse effect, which as a result appears to be increasing the average temperature on Earth at a much faster rate than typical ecological and geological timescales.