名校勵志英語演講 第6期:給大學(xué)畢業(yè)生的幾個忠告

[00:00.41]I began teaching with the idea of giving back; 我懷著回報社會的想法，開始了教學(xué)生涯。 [00:02.52]But I received more than I gave. This brings me to the final movement of this speech. 然而，我得到的多于我付出的。這就引出了這次演講的最后一篇樂章。 [00:08.31]It begins with a story about an extraordinary scientific discovery and a new dilemma that it poses. 首先我要講一個了不起的科學(xué)發(fā)現(xiàn)，以及由此帶來的新挑戰(zhàn)。 [00:15.15]It’s a call to arms and about making a difference. 它是一個戰(zhàn)斗的號令，到了做出改變的時候了。 [00:19.39]So here is the movement.In the last several decades, our climate has been changing. 現(xiàn)在開始本次演講的第一章。過去幾十年中，我們的氣候一直在發(fā)生變化。 [00:25.47]Climate change is not new: the Earth went through six ice ages in the past 600,000 years. 氣候變化并不是現(xiàn)在才有的，過去60萬年中地球就發(fā)生了6次冰河期。 [00:32.47]However, recent measurements show that the climate has begun to change rapidly. 但是，最新的測量表明氣候變化加速了。 [00:37.27]The size of the North Polar Ice Cap in the month of September is only half the size it was a mere 50 years ago. 9月份，北極冰蓋的覆蓋面積只相當(dāng)于50年前的一半。 [00:46.04]The sea level which been rising since direct measurements began in 1870 is now five times faster, 1870年起，人們開始測量海平面上升的速度， [00:53.41]at a rate now five times faster, than at the beginning of recorded measurements. 現(xiàn)在海平面上升的速度是那時的5倍。 [00:59.19]Here’s the remarkable scientific discovery. For the first time in human history, 一個重大的科學(xué)發(fā)現(xiàn)就這樣產(chǎn)生了。 [01:05.45]science is now making predictions of how our actions will affect the world 50 and 100 years from now. 科學(xué)第一次預(yù)測出我們的行為對50到100年后的世界有何影響。 [01:12.32]These changes are due to an increase in carbon dioxide put into the atmosphere since the beginning of the Industrial Revolution. 這些變化的原因是，從工業(yè)革命開始，人類排放到大氣中的二氧化碳增加了。 [01:21.48]The Earth has warmed up by roughly 0.8 degrees Celsius since the beginning of the Revolution. 這使得地球的平均氣溫上升了0.8攝氏度。 [01:28.38]There is already approximately a 1 degree rise built into the system, even if we stop all greenhouse gas emissions today. 即使我們立刻停止所有溫室氣體的排放，氣溫仍然將比過去上升大約1度。 [01:35.55]Why? It will be decades to warm up the deep oceans before the temperature reaches a new equilibrium. 為什么呢?因為在氣溫達(dá)到均衡前，海水溫度的上升將持續(xù)幾十年。

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