Children don't play outside on the streets like they used to. Kathy Hirsh-Pasek, professor of psychology at Temple, terms the recently declining numbers of children who play as "the next global warming." "If we take play away from young children and fill all their time with directives, then 20 years from now, we're going to see exactly the crisis that we're starting to see today, which is a workforce woefully unprepared to operate in the global marketplace,” she said.