On Tuesday morning, I joined General Services Administration Administrator Martha Johnson in Chicago, Illinois, at the first-ever GreenGov Supply Chain Summit to announce a voluntary collaboration between the Federal Government and vendors and suppliers to create a greener and more efficient supply chain.

WHITEHOUSE: Greening the Supply Chain

The Food and Drug Administration will publish new voluntary guidelines to protect the nation's food supply against intentional contamination by terrorists.

CNN: graphic

"Our responsibility is to work with those private providers, to work with the voluntary organisations, to work with schools to try and increase the supply, " he told 5 live.

BBC: Adult plays with a toddler

By liberating the supply side, unlocking the potential of both the private and voluntary sectors, and providing people with meaningful, accessible information about public services, we will give people real choice, and thereby improve quality and productivity.

BBC: In full: Cameron's economy speech

Due in part to traditional beliefs and distrust of the medical system, voluntary donations are rare in China, where the need for organs far exceeds the supply.

WSJ: China to Stop Harvesting Inmate Organs