Tom Steyer, center, a billionaire environmental activist who wants to blast the issue of climate change to the front lines of American politics, at the NextGen Climate Action office in San Francisco. Photograph:Jason Henry/The New York Times

Billionaire environmental activist Tom Steyer will give a boost to 2014 political candidates from seven US states who work to combat climate change, c(...)

When US National Security Agency director general Keith Alexander was asked a year ago if the Bluffdale centre would hold the data of Americans, he replied no: “We don’t hold data on US citizens.” Photograph: Jason Reed/Reuters

At the Husband and Wife lingerie store in Bluffdale, Utah, in Mormon country – where babies are welcome amid the sex toys and the motto is “Classy, ta(...)

The National Security Agency campus in Fort Meade, Maryland. The agency has secretly circumvented or cracked much of the digital scrambling that protects global commerce, e-mails, phone calls, medical records and web searches, according to newly disclosed documents. Photograph: Government handout via The New York Times

The National Security Agency routinely violated court-ordered privacy protections between 2006 and 2009 by examining phone numbers without sufficient (...)

 President Barack Obama at the White House yesterday with departing national security adviser Tom Donilon,  incoming national security adviser Susan Rice (centre) and  Samantha Power, the new US ambassador to the UN.  Photograph: Alex Wong/Getty Images

The Obama administration has acknowledged that it is collecting a massive amount of telephone records from at least one carrier, reopening the debate (...)