1. I am leaving for London tomorrow and I haven't packed (my bags) yet.2. I haven't packed up for Europe yet because something urgent came up.
 pack (one's bags/things) pack up
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 problem. 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.