What is global warming (aka “greenhouse effect,” “climate change”)? Sunlight arrives here on earth, giving us light. Some of the light hits the ground, readily penetrating it, and then gets converted into heat radiation. Now, the air has just a little bit of CO2 in it. That CO2 acts a bit like the glass in a greenhouse, or a sweater: it traps the heat, thus keeping the earth warm and comfortable. But now we’re increasing the amount of CO2 and other greenhouse gases such as methane (natural gas), and the earth is getting warmer.
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