Global tech leaders will pack Lisbon's annual Web Summit from Tuesday to talk Artificial Intelligence, robots and startups -- all under the shadow of tensions over cutting-edge tech and the natural resources needed to build it.

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

Tech leaders gathered at Monday's opening night, starring Swedish startup founder Anton Osika, whose Lovable software company is touted as the fastest growing in history.

The audience also cheered TikTok star Khaby Lame, tennis great Maria Sharapova and an Olympics-style parade of tech founders bearing their nations' flags.

Here are some of the key themes at the show:

- Shifting sands -

"This year, more than any ye

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