Former South African President and civil rights defender Nelson Mandela dedicated his life to fighting for equality and ultimately helped overthrow South Africa's racist apartheid system. His accomplishments are now celebrated each year on July 18, International Nelson Mandela Day.
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Human activities contribute to climate change by causing changes in Earth's atmosphere in the amounts of greenhouse gases, aerosols (small particles), and cloudiness. The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere.
