"Regularly performing well in worldwide livable city rankings, Vancouver has a new ambitious goal of becoming the greenest city in the world by 2020?"
closed as off-topic by choster, Chenmunka, jimm101, Rand al'Thor, TaliesinMerlin Feb 19 at 21:23
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Please include the research you’ve done, or consider if your question suits our English Language Learners site better. Questions that can be answered using commonly-available references are off-topic." – choster, Chenmunka, Rand al'Thor
The word "well" in this sentence is an adverb - it modifies the verb "performing" and, as Jim notes, it means that Vancouver is highly ranked as being a very livable city. (Their performance in these rankings is very good.)