In the same way that people now download their favorite music onto their iPod, he said that viewers would soon be downloading most favorite programs onto their computers. “85% of all videos we watch are pre-recorded, so you can set your system to download them all the time, ” said Mr Cerf, who is now the vice-president of the Google, the world’s largest search engine. “You’re still going to need live television for certain things-like news, sporting events and emergencies-but increasingly it is going to be almost like the iPod. ”

　　Although television on demand has not yet become a mainstream activity in the UK, the BBC, ITV and Channel 4 have all spent vast sums of money on technology which enables viewers to watch their favorite shows on their computers.

　　But some critics (批评人士), including some Internet service providers, have warned that the Internet will collapse with millions of people downloading programs at the same time. Over the next four years, it is thought that the number of videos watched over the Internet will be four times as big as that. Broadband companies claim that the service will cause “traffic jams”, which will cost millions of pounds to get it to normal.

　　But Mr Cerf dismissed the warnings as “scare thoughts”, saying that critics had predicted 20 years ago that the net would collapse when people all around the world started to use it all together. “In the past 30 years it’s increased a million times. We’re far from reaching the capacity, ” he said, “It’s an understandable worry when they see huge amounts of information being moved around online. ”

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