The world is not only hungry, hut also thirsty for water. This may seem strange to you. since nearly 75 % of the earth's surface is covered with water. But about 97% of this huge amount is sea water, or salt water. Man can only drink -and use the other the fresh water that comes from rivers, lakes.underground- and other sources. And we cannot even use all of that, because some of it is in ihe form of icebergs and glaciers. Even worse, some of it has been polluted.
However, as. things stand today, this small amount of fresh water, which is constantly being replaced by rainfall, is still enough for us. Hut our need for water is increasing rapidly almost day by day. Only if wc take steps to deal with this problem now can wc avoid a severe worldwide water shortage later on. A limited water supply would have a bad effect on agriculture and industry. Let rne give you just one small example of how necessary water is to industry. Did you know that to produce a single ton of steel, il takes about 91*000 liters of water?
We all have to learn how to stop wasting our precious water. One of Ihe first steps wc should take is to develop ways of reusing it. Experiments have already been done in this field, but only on a small scale. For us. the systems are as important as the spacecraft.
世界是不僅餓了,而且渴望雨水。這可能看起來很奇怪。因?yàn)榻?5%的地球表面被水覆蓋著。但是大約97%的大量海水,或鹽水。人只能喝——使用其他淡水來自河流,湖泊。地下,和其他來源。我們甚至不能使用的,因?yàn)樵趪鴥?nèi)的一些形式的冰山和冰川。更糟糕的是,其中一些已經(jīng)被污染了。
然而,隨著。站在今天,這少量的淡水,這是不斷被降雨,對(duì)我們來說仍然是足夠的。小屋幾乎我們對(duì)水的需求迅速增加。只有當(dāng)wc采取措施處理這個(gè)問題現(xiàn)在wc可以避免嚴(yán)重的全球水資源短缺。有限供水對(duì)農(nóng)業(yè)和工業(yè)會(huì)有壞的影響。讓東給你的只是一個(gè)小例子是多么必要的水行業(yè)。你知道生產(chǎn)一噸鋼鐵、il大約需要91 * 000公升的水嗎?
我們都必須學(xué)會(huì)如何停止浪費(fèi)我們寶貴的水。廁所內(nèi)的第一個(gè)步驟應(yīng)該是開發(fā)的方法來重用它。實(shí)驗(yàn)已經(jīng)完成了在這一領(lǐng)域,但只在小范圍內(nèi)。對(duì)我們來說。宇宙飛船的系統(tǒng)一樣重要。
However, as. things stand today, this small amount of fresh water, which is constantly being replaced by rainfall, is still enough for us. Hut our need for water is increasing rapidly almost day by day. Only if wc take steps to deal with this problem now can wc avoid a severe worldwide water shortage later on. A limited water supply would have a bad effect on agriculture and industry. Let rne give you just one small example of how necessary water is to industry. Did you know that to produce a single ton of steel, il takes about 91*000 liters of water?
We all have to learn how to stop wasting our precious water. One of Ihe first steps wc should take is to develop ways of reusing it. Experiments have already been done in this field, but only on a small scale. For us. the systems are as important as the spacecraft.
世界是不僅餓了,而且渴望雨水。這可能看起來很奇怪。因?yàn)榻?5%的地球表面被水覆蓋著。但是大約97%的大量海水,或鹽水。人只能喝——使用其他淡水來自河流,湖泊。地下,和其他來源。我們甚至不能使用的,因?yàn)樵趪鴥?nèi)的一些形式的冰山和冰川。更糟糕的是,其中一些已經(jīng)被污染了。
然而,隨著。站在今天,這少量的淡水,這是不斷被降雨,對(duì)我們來說仍然是足夠的。小屋幾乎我們對(duì)水的需求迅速增加。只有當(dāng)wc采取措施處理這個(gè)問題現(xiàn)在wc可以避免嚴(yán)重的全球水資源短缺。有限供水對(duì)農(nóng)業(yè)和工業(yè)會(huì)有壞的影響。讓東給你的只是一個(gè)小例子是多么必要的水行業(yè)。你知道生產(chǎn)一噸鋼鐵、il大約需要91 * 000公升的水嗎?
我們都必須學(xué)會(huì)如何停止浪費(fèi)我們寶貴的水。廁所內(nèi)的第一個(gè)步驟應(yīng)該是開發(fā)的方法來重用它。實(shí)驗(yàn)已經(jīng)完成了在這一領(lǐng)域,但只在小范圍內(nèi)。對(duì)我們來說。宇宙飛船的系統(tǒng)一樣重要。