chapter Ⅱ 站在巨人的肩上（12）

    我怀着回报社会的想法，开始了教学生涯。我的一生中，得到的多于我付出的，所以我要回报社会。这就引出了这次演讲的最后一个乐章。首先我要讲一个惊人的科学发现，以及由此带来的新挑战。它是一个战斗的号令，到了做出改变的时候了。

    i began teaching iving back; i received more than i gave. this brings me to the final movement of this speech. it begins  a difference.

    过去几十年中，地球的气候一直在发生变化。气候变化并不是现在才有的，过去60万年中就发生了6次冰河期。但是，现在的测量表明气候变化加速了。现在北极冰盖在9月份的大小，只相当于50年前的一半。从1870年起，人们开始测量海平面上升的速度，现在的速度是那时的5倍。一个重大的科学发现就这样产生了。科学第一次在人类历史上，预测出我们的行为对50～100年后的世界有何影响。这些变化的原因是，从工业革命开始，人类排放到大气中的二氧化碳增加了。这使得地球的平均气温上升了大约0.8。c。即使我们今天立刻停止所有温室气体的排放，气温仍然将比过去上升大约1。c。为什么？因为在温度达到新的平衡前，海水温度的上升将需要几十年时间。

    in the last several decades, our climate has been changing. climate change is not neh six ice ages in the past 600,000 years. houn to change rapidly. the size of the north polar ice cap in the month of september is only half the size it o. the sea level  since direct measurements began in 1870 at a rate that is noinning of recorded measurements. here’s the remarkable scientific discovery. for the first time in human history, science is no predictions of hoes are due to an increase in carbon dioxide put into the atmosphere since the beginning of the industrial revolution. the earth has hly 0.8 degrees celsius since the beginning of the revolution. there is already approximately a 1 degree rise built into the system, even if reenhouse gas emissions today. overnmental panel on climate change predicts that there is a fifty-fifty chance the temperature rees by the end of this century. this increase may not sound like much, but let me remind you that during the last ice age, the rees colder. during this time, most of canada and the united states dolacier. a rees e  humans, . i’ve been told for example, that, in a much ger. i  buzzing around is a precursor.</p>

    <b>狠男人小说最快更新，无弹窗阅读请。

狠男人网最快更新，无弹窗阅读请收藏狠男人小说网(www.41nr.com)。