Google says that intelligence gathering techniques used by the US and other governments are putting web users' online security at risk.
The online giant's senior vice president Ken Walker said: "We have invested so much in encryption and the fight for transparency around government requests for information.
"That's undermined when you have wholesale collection of data done in secret without independent oversight by many governments around the world," Walker told the BBC Radio 4 Today programme.
More top news
Parts of the UK will feel colder than the Arctic Circle in the coming week as bitter winds make it feel -15C in some places.
At least three people have been killed in clashes in eastern Ghouta just hours after the UN Security Council backed a 30-day ceasefire.
Very Very Cold !