What is the description of Global climate change?

What is the description of Global climate change?
A . Exhaust fumes from daily traffic are contributing to a decrease in air quality that is slowly deteriorating the number of harvestable foods on Earth.
B. Human activity is contributing to a buildup of greenhouse gases in Earth’s atmosphere that is slowly increasing the average temperature near Earth’s surface.
C. IT industry waste is contributing to a buildup of CO2 in the Earth’s ground that is quickly increasing the average temperature of Earth’s surface.

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Answer: B