Among those that do, the definition varies: 55% define sustainability as the management of issues related to the environment (for example, greenhouse gas emissions, energy efficiency, waste management, green-product development, and water conservation).

FORBES: Employee Engagement And Your Company's Bottom Line

Spread over nine equally-weighted categories, the scorecard rates colleges on factors like sustainable policies by administration, commitment to energy efficiency and conservation, food and recycling policies, campus-wide green building initiatives, student involvement, alternative transportation.

FORBES: Sustainability Report Card: How Green Is Your College?

Matthew Evans is an 18-year old who had the vision to create a non-profit called Discover Green, which is based in Pflugerville, Texas, raises awareness around energy and water conservation, and constructs sustainable landscape models throughout the community.

WHITEHOUSE: One Tree at a Time