1. 表明因果关系类关键词：as a result, result in, result from, lead to, because of, due to, contribute to, owning to, hence, since, accordingly, consequently, therefore, in that, etc.
2. 表明转折点类关键词：despite, in spite of, but, although, though, while, yet, otherwise, on the other hand, however, nevertheless, nonetheless, etc.
3. 表明较为类关键词：more, than, less, the least, the most, prefer, equally, likewise, similarly, in comparison, as…as, etc.
4. 表明并排类关键词：first, second…finally, and, or, as well as, one… the other,not…nor…, etc.
And the future- If we are to believe the forecasts, it is predicted that two thirds of the world population will be without fresh water by 2025. But for a growing number of regions of the world the future if already with us. While some areas are devastated by flooding, scarcity of water in many other places is causing conflict. The state of Texas in the United States of America is suffering a shortage of water with the Rio Grande falling to reach the Gulf of Mexico for the first time in 50 years in the spring of 2000, pitting region against region as they vie for water sources. With many parts of the globe running dry through drought and increased water consumption, there is now talk of water being the new oil.
剖析：此段开始先提出了“依据预测分析到2030年全球上把有三分之二的人口喝不上谈水”然后各自用转折词but，while进一步提出一些地域因为洪水泛滥产生的毁坏，在其他很多地区水的缺少已越来越逐步不容乐观。然后从“The state of Texas…water sources”根据一个关键点举例 (得克萨斯州的大家已经饱受少水之苦)来作进一步表明。