1. PART A: Which statement identifies the central idea of the text? O A Scientists have confirmed that humans release CO2, which warms
the Earth's surface and contributes to global warming.
OB CO2 is only one of the many gases that is trapped in our
atmosphere and contributes to global warming.
OC Scientists have only been able to confirm significant increases in
CO2 and temperatures in two locations on Earth.
D The greenhouse effect is a natural process on Earth, in which heat is
trapped by our atmosphere to keep it warm enough for life.
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