In conclusion, I'd like to reiterate the importance of being environmentally friendly.
In conclusionIn conclusion 常用來做一篇文章最後一段的開頭，意思就是「行文至此」
這是一個連環問題: 燃燒石油導致二氧化碳增加，二氧化碳增加導致溫室效應，溫室效應導致冰層融化、海平面上升。 (請填空)
This is a chain of prolems. Burning oil leads to increase in carbon dioxide, which leads to the greenhouse effect, which leads to melting of glaciers, which leads to rising sea levels.