The Council on Tall Buildings and Urban Habitat's (CTBUH) inaugural America's Regional Conference, "Green(er) Capital: Investing in a Sustainable Urban Future," looks at the future of vertical urbanism. Today, numerous challenges, from climate-change-induced flooding to housing affordability affect city development. But within these challenges lie enormous opportunities, which can pay huge social, environmental, and financial dividends when leaders unite in purpose. By making concerted efforts in decarbonizing the built environment, repositioning outdated building stock, managing density, attracting sustainability-focused private investment capital, and securing the commitment of impassioned government, we can make our cities greener and more prosperous.