1.       Yet little has been done to solve this problem worldwide. (来源：英语学习门户网站EnglishCN.com)

2.       To make one final point, …

3.       As we are all aware …

4.       … has long been an issue debated mainly in … around the world.

5.       One example is that …

6.       Conversely

7.       The final point that I would like to make is that …

8.       Likewise, it is no longer required that … nor is it …

9.       at all costs

10.   What is important to remember is that …

11.   preservation and protection

12.   In this increasingly global world, …

同义词的使用：

解决：solve, resolve, deal with, cope with, handle, tackle

消除：get rid of, eradicate, eliminate

依赖：rely on, depend on, count on

十分：very much, immensely, hugely, largely, greatly, enormously, tremendously

损害：damage, hurt, injure, harm, impair

给予：give, offer, render, impart, provide

发展：develop, cultivate, foster

优势：advantage, merit, virtue, benefit, upside, strength

缺陷：disadvantage, detect, demerit, drawback, downside, weakness