科学家们正在研究地球变暖的原因。

Scientists are studying the causes of Earth's warming.

所以，当阳光照射在地球上，地球变暖。日落后，地球开始降温。

So, when the sun is shining on the Earth, it warms up. After the sun sets, it has time to cool down.

大多数科学家认为，人类活动是地球变暖的主因，因此需要人类做出改变，来扭转地球变暖的趋势。

Most scientists say human activity is behind global warming and that it’s up to humans to make changes to stem the tide.

毫无疑问地球正在变暖，但究竟是人类活动使地球变暖还是它仅仅是一种自然现象，就此引发了激烈的争论。

There is no doubt that the earth is becoming warmer but there is fierce debate over whether it is human activity that has caused this global warming or whether it is just a natural phenomenon.

许多科学家把地球变暖归诸温室效应。

Many scientists attribute global warming to the greenhouse effect.

科学家预测伴随着地球变暖极端天气会增多。

Scientists have predicted that more extreme weather will accompany global warming.

之所以这么叫，是因为它能把太阳产生的热能吸附在地球的大气层中，加剧地球变暖——把地球变成温室一样的地方。

And it's called that because it traps the sun's heat energy in the Earth's atmosphere and is helping warm the planet — sort of like a greenhouse.

很多科学家把企鹅数量减少的原因怪罪为地球变暖。

Many scientist blame global warming for the decrease in penguin populations.

后来随着地球变暖，冰川熔化，形成了这五大湖。

Then when the earth started to warm up, the glacier melted and formed the Great Lakes.

以二氧化碳为主的温室气体是如何使地球变暖的呢？

WHAT are greenhouse gases and how do they make Earth warmer?