Penturbia asserted that high costs and urban crowding would drive the middle class out of cities and suburbs.

FORBES: Life 2.0

It was urban crowding that made the bacterium so successful and so virulent.

WSJ: Matt Ridley on Infectious Diseases and Standards of Living | Mind & Matter

Without money or resources, climate refugees will likely stay within their own borders, accelerating movement from rural areas to urban centers and crowding into cities already bursting at the seams.

CNN: Climate change may displace up to 200 million