Global tech leaders packed Lisbon’s annual Web Summit Tuesday to talk artificial intelligence, robots and startups — all under the shadow of global tensions over cutting-edge hardware and software and the resources needed to build them.

Lanyard-wearing visitors were exploring bright blue-and-pink stands under a grey November sky, on the lookout for the latest in quantum computing or humanoid robots.

Over four days, the “Davos for geeks” is set to welcome over 70,000 visitors from 150 countries, including 2,500 startups and 1,000 investors, according to organisers.

China’s climb towards tech dominance is on mind of many attendees.

“Half the world’s computer scientists and computer engineers who are on the frontier of these technologies are in China,” Nvidia’s vice-president of simulatio

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