A letter report issued by the Government Accountability Office with an abstract that begins "According to the Department of Homeland Security (DHS), protecting and ensuring the resiliency (the ability to resist, absorb, recover from, or successfully adapt to adversity or changing conditions) of critical infrastructure and key resources (CIKR) is essential to the nation's security. By law, DHS is to lead and coordinate efforts to protect several thousand CIKR assets deemed vital to the nation's security, public health, and economy. In 2006, DHS created the National Infrastructure Protection Plan (NIPP) to outline the approach for integrating CIKR and increased its emphasis on resiliency in its 2009 update. GAO was asked to assess the extent to which DHS (1) has incorporated resiliency into the programs it uses to work with asset owners and operators and (2) is positioned to disseminate information it gathers on resiliency practices to asset owners and operators. GAO reviewed DHS documents, such as the NIPP, and interviewed DHS officials and 15 owners and operators of assets selected on the basis of geographic diversity. The results of these interviews are not generalizable but provide insights."

A letter report issued by the Government Accountability Office with an abstract that begins "Policymakers have raised questions about geoengineering--large-scale deliberate interventions in the earth's climate system to diminish climate change or its impacts--and its role in a broader strategy of mitigating and adapting to climate change. Most geoengineering proposals fall into two categories: carbon dioxide removal (CDR), which would remove carbon dioxide (CO2) from the atmosphere, and solar radiation management (SRM), which would offset temperature increases by reflecting sunlight back into space. GAO was asked to examine (1) the state of geoengineering science, (2) federal involvement in geoengineering, and (3) the views of experts and federal officials about the extent to which federal laws and international agreements apply to geoengineering, and any governance challenges. GAO examined relevant scientific and policy studies, relevant domestic laws and international agreements, analyzed agency data describing relevant research for fiscal years 2009 and 2010, and interviewed federal officials and selected recognized experts in the field."