(Reuters) - A farmer works on a drought-hit paddy field in the outskirts of Chongqing municipality in this March 24, 2009 file photo. Global warming threatens China's march to prosperity by cutting crops, shrinking rivers and unleashing more droughts and floods, says the government's latest assessment of climate change, projecting big shifts in how the nation feeds itself. REUTERS/Stringer/Files (CHINA - Tags: ENVIRONMENT AGRICULTURE DISASTER)

(AP) - FILE - In this June 7, 2010, file photo, Apple CEO Steve Jobs smiles with a new iPhone at the Apple Worldwide Developers Conference in San Francisco. In the white-hot competition for tech talent, some workers are alleging Silicon Valley's top companies conspired to keep employees from switching teams. A federal class-action suit claims that senior executives at Google, Intel, Adobe, Intuit, Lucasfilm, Pixar and Apple entered into secret anti-poaching agreements not to hire each other's best workers. And plaintiffs say e-mails uncovered during a U.S. Justice Department investigation put Steve Jobs at the center of the alleged conspiracy of so-called 'gentlemen's agreements.' The defendants say there was no conspiring, just one-to-one pacts between individual companies in the course of doing business and collaborating on innovative products. Apple is seeking to have the case thrown out. (AP Photo/Paul Sakuma, File)