1. Yet little has been done to solve this problem worldwide.
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. preservation1 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
