Bjarke Ingels was asked to build a new facade for a glorified high tech incinerator, or what they now politely call a waste-to-energy system. He turned it into a giant ski hill and designed it to blow smoke rings. What's not to love?
How about the fact that it would increase CO2 emissions by 30% and would lock the City of Copenhagen into burning waste for the next thirty years. According to Atlantic Cities,
The city has opted to push the project back and focus instead on implementing better ways for citizens to recycle materials and prevent the generation of a literal mountain of trash instead of glorifying it (with an entourage of bikini-sporting skiers no less).