The University began a Greenhouse Gas Inventory starting in 2001, and is among the top ten largest university purchasers of renewable energy credits in the country, accounting for seven percent of energy use. A $12 million Green Campus Loan Fund is available for sustainability initiatives and projects. To date, more than $7 million has been invested in 110 projects. Projects average a simple payback of three years and a return on investment of 33 percent. Environmental savings include over 66.7 million pounds of carbon dioxide emissions reductions, 12.7 million gallons of water, and 200,000 pounds of solid waste per year.