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Many people may not realize it, but the greenhouse effect and global warming are totally different things. The greenhouse effect is something that happens with all celestial bodies — planets, moons, and such—that have an atmosphere. Anyway, back to the greenhouse effect. The greenhouse effect is a process that happens when the sun's heat enters Earth's atmosphere. The sun's rays warm the earth, and the atmosphere keeps the heat in, just like a greenhouse. It's a very natural thing, and in most cases, the planet system knows how to balance itself out. Anyway, like I said, it's a pretty natural process.
很多人或許沒有意識到，但是溫室效應和全球變暖是兩種完全不同的事。溫室效應是所有有大氣層的天體都會出現的現象，比如行星、月球，等等。不管怎樣，繼續說溫室效應。當太陽的熱量進入地球大氣層時，就會出現溫室效應。太陽光使地表暖和起來，而大氣層將熱量保存起來，就像個溫室一樣。溫室效應是一個十分自然的過程，多數情況下，地球系統自有辦法保持平衡?？傊?，就像我說的，它是一個很自然的過程。
Now all this gets messed up when humans, um, add stuff to Earth's atmosphere. That's when global warming, which is not a natural process, happens. See, what happens is that people create, um, things that create extra heat. For example, cars. We drive cars all the time. So we drive our cars, and our cars bum gas, and this exhaust is pretty hot. And the atmosphere keeps this heat around the planet. Plus, all of our machinery and our factories and stuff, they all produce heat. So all this stuff creates what scientists are calling global warming. Earth's surface and atmosphere just keep getting hotter.
當人類在大氣中增加了很多物質時，所有的這一切就變糟糕了。那時候就會出現很不自然的過程——全球變暖。全球變暖是由于人們制造了很多排放多余熱量的事物。比如，汽車。我們一直都在開車。我們開車，車會產生氣體，而這些氣體溫度較高。大氣層將這些熱量保存在地球周圍。另外，我們的機器、工廠等等，都會產生熱量。所有這些東西就造成了科學家所說的全球變暖。地球表面和大氣層都變得越來越暖。
Now global warming has many negative effects, but I think one of the biggest problems with global warming is the melting of polar ice caps and glaciers. See, our planet has huge chunks of ice at both of its poles. And when global warming happens, um, the overall temperature of the planet increases. And what this does is it makes polar ice melt. So when ice melts, it turns into water, which goes into our oceans. And that causes the level of water to rise. And this could also cause major flooding.
現在全球變暖有很多負面影響，但是我覺得全球變暖最大的問題之一就是極地冰蓋和冰川的融化。我們的地球在兩極地區都有大量的冰川覆蓋。出現全球變暖以后，地球的整體溫度上升。這帶來的影響就是極地冰雪融化。那么冰雪融化時，就會變成水，流入海洋。這會使海平面上升。也會造成嚴重洪災。
Question 23. What's the difference between greenhouse effect and global warming?
問題23 溫室效應和全球變暖的區別是什么？
Question 24. According to the speaker, why does global warming happen?
問題24 根據發言人，為什么會出現全球變暖？
Question 25. What's the speaker's biggest concern with global warming?
問題25 發言人對全球變暖最大的擔憂是什么？
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