The Mayor of Austin, Texas, US, Steve Adler, poses for pictures during the C40 Mayors Summit in Mexico City on December 2, 2016. / AFP / Omar TORRES (Photo credit should read OMAR TORRES/AFP via Getty Images)
The Mayor of Austin, Texas, US, Steve Adler, poses for pictures during the C40 Mayors Summit in Mexico City on December 2, 2016. / AFP / Omar TORRES (Photo credit should read OMAR TORRES/AFP via Getty Images)