mini還是全文聽寫模式，很多童鞋可能進來看到【專八】可能會有點膽怯，剛開始是會感覺到有點吃力哦，但這就是專八。希望大家可以耐心的認(rèn)真聽寫O(∩_∩)O~

Today's lecture is about the Greenhouse Effect.

溫馨提示：除了聽到的第一個greenhouse effect是首字母大寫外，其余都是小寫哦！

Good morning. Today's lecture is about the Greenhouse Effect. The "greenhouse effect" often gets a bad rap because of its association with global warming, but the truth is we couldn't live without it. First, I'd like to ask you what causes the greenhouse effect? Life on earth depends on energy from the sun. About 30% of the sunlight that beams toward Earth is deflected by the outer atmosphere and scattered back into space. The rest reaches the planet's surface and is reflected upward again as a type of slow moving energy called infrared radiation. As it rises, infrared radiation is absorbed by "greenhouse gases" such as water vapor, carbon dioxide, ozone and methane, which slows its escape from the atmosphere. Although greenhouse gases make up only about 1% of the Earth's atmosphere, they regulate our climate by trapping heat and holding it in a kind of warm-air blanket that surrounds the planet.