The ideas generated from this Student Design competition run by CTBUH are highly commendable. In Particular I liked the “Clean Air Tower” by Alec Balchin which responds to issues of air quality. His design for Tianjin uses industrial air-cleaning technology together with a stack effect air circulation system to clean 8.5 million cubic meters of air per year. How good would it be to have our buildings clean the environment rather than destroy it?

CTBUH Announces Five Finalists in its Student Competition | ArchDaily.