The US Department of Energy released the second SAP in July 2007, entitled "Scenarios of Greenhouse Gas Emissions and Atmospheric Concentrations and Review of Integrated Scenario Development and Application". This two-volume report explored emission scenarios that could stabilize the net effect of greenhouse gases at four different levels. It also outlined key principles and approaches for developing global change scenarios. The two reports were each written by a subset of the members of the Climate Change Science Program Product Development Advisory Committee, a panel organized under the Federal Advisory Committee Act.