sentences:  teaching a balance between production and consumption in a way that preserves the delicate balance of nature.This organization has become an advocate for teaching sustainability at all institutions of higher learning through its incorporation into the curriculum.An important contribution Dr. Cortese made was the establishment of the American College & University Presidents' Climate Commitment, an organization of more than 600 colleges and universities in every state and the District of Columbia who have committed to take action on climate and prepare students through research and education to solve the climate challenges of the 21st century .