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Government take concrete actions to stop the fires. some scientists worry the fires will lead to a giant loss of forest, biodiversity and contribute to more greenhouse gases. the fires also escalating tensions with france and other western countries as the g7 summit got underway in france today. [speaking french] >> translator: the amazon is our common good. we are all concerned. we need to help brazil and other countries put down these fires, because it is the treasure of our biodiversity and our climate thanks to oxygen that it emits and thanks to the carbon it absorbs. >> reporter: brazil's...

Enormous data centers in germany alone use the equivalent of five large power plants about forty such facilities operate worldwide just to power the internet. if the worldwide web were a country it would rank sixth in the world for the amount of energy it uses and carbon it emits. here comes a board saying here you can see how much energy a data center of this size consume is right now in one of our two energy power supply facilities the optional it is nearly thirty megawatts. that's enough to power a small town or several small communities here in germany. a lot of the energy is used to cool ...

Of energy it uses and carbon it emits. to come out as it would seeing here you can see how much energy a data center of this size to consume is right now in one of our two energy power supply facilities the opposite is nearly thirty megawatts. that's enough to power a small town or several small communities here in germany when i was from fossil. a lot of the energy is used to cool the computers which he does when they're in use. the curtis think that's why the technology requires electricity and water and electricity powers the fans and the pumps and the water cools the heat exchangers i woul...

Ellie johnson with politico. you mentioned a couple of specifics from kim jong-un. the retu the remains and destruction of the nuclear site. >> and more. >> you said the las was an add-on and not the agreement. he gave you his word. if he doesn't follow through on these things, what are you prepared to do in response and will you lose faith in the process? >> no. i think he will do it. i really believe it. it was really the engine testing site in addition to all of the other things that they agreed to do. they have a powerful engine testing site. again, we're able to see because of the heat it...

A fan wanted to know more. but see my father how from iraq wants to know. how do scientists determine the chemical composition of faraway stars. by the light they emit split into its color components light forms a continuous spectrum. when light impinges on atoms or molecules a portion of it is absorbed that creates black lines at distinct frequencies. in some ways it's like a fingerprint. all the elements in a star leave their fingerprint in the light spectrum that it emits. these spectra can differ greatly that's because the cocktail of elements that make up a star changes over time. this is...