let's go over down to rebecca morrell in stockholm with the latest. >> yes, well, i am here in stockholm where a major report into the state of the planet's climate has been released today and scientists are saying that climate change is happening, unequivocal. and we are seeing unprecedented of facts on the earth. temperatures are going up. the ocean temperatures are going up. air temperature, too, and sea levels are rising and ice is melting. they say this is the most comprehensive assessment they have today and they think man is to blame for these problems. i am joined by a professor who is chair of the ipcc. you say you are 95% certain that climate is caused by people. how can you be so sure? >> simply because there is a substantial amount of published literature now, all of which clearly shows, and we have actually quantify this to the extent of saying 95%. although this clearly shows that humans are causing climate change. and my -- may i say that the bulk of this effect has been felt since the middle of the 2050 century, since about or so, whatever things are largely the result of