very difficult global conversation this is a little piece of it thank you very much professor kenneth rogoff at heart from harvard university thank you. our correspondents now the milan reporting there the c.e.o. of google on an alphabet called for global regulation on artificial intelligence at the world economic forum meeting in davos sundar pichai warned of the dangers of new technology as well as the benefits he says legislation will be needed to avoid the misuse of machines by venture arms high tech eyes are always watching him down force this time it was the turn of one of the biggest names in technology to be captured on camera so breaks alphabet c.e.o.'s send up each i was interviewed by the founder of the world economic forum klaus schwab clay discussed perhaps the biggest ethical challenge facing the tech world is artificial intelligence it's more profound than fire or electricity or any of the other bigger things we're working on it has tremendous positive sites through it but you know it has real negative consequences. facial recognition is one of the alphabet bosses examples tho

sally bundock has been speaking to former imf economist kenneth rogoff in davos and asked how optimisticis about phase 2 of the trade agreement. his trade deals are mostly bad stopping most of what he has done to trade is disrupt the global economy. he talked about how much the us was collecting in tariffs, every study says that the us consumers are paying for it. things are going better now, if you are beating your head against the wall and you stop it's better. his trade policy is one of the worst aspect of his economic policy, but politically, he seems to think it's a winner. at the start of the imf has downgraded forecast for this year and next yearjust slightly. what is your outlook? i'd tend to believe that in global forecasting, when the thing you are focusing on is political, things aren't so bad, i'd worry about china slowing down dramatically, a worry about emerging markets who piled up, what happens when things slow down? given economic cycles as it were in terms of global growth, we have been chugging away for quite some time now. economist such as yourself would say things w

francine: kenneth rogoff of harvard university stays with us. we will talk about sustainability.in davos as we await president trump to start his inaugural speech. this is bloomberg. ♪ tom: from the world economic forum, dr. clouse schwab celebrating the anniversary, 15 years of the world economic forum, and he does this with an important speech. carrie lam was here yesterday from hong kong, angela merkel will be here, and steve schwarzman coming up. we are here with ken rogoff it is so different than the victory lap the president took three years ago. toncine: it was interesting hear ian bremmer say the president will get another victory lap but the timing is a little awkward because the impeachment is going to start. tom: let's walk through the process. the house of representatives has impeached the president but that does not mean he is guilty. they have walked across the documentsd handed the and read the documents to a senate which is 100 senators holding their own trial with the chief justice, and we will see that today on bloomberg. francine: i have a couple of questions o