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Eastern siberia, for about 3 and a half hours i would still be in the fire zone. one of the reasons why president trump apparently offered that help to vladimir putin is because the russians are having a lot of trouble fighting these fires. they'll try and contain the fires around the areas where there are urban settlements but they're not going to do anything against those fires in more remote areas. the big problem is those fires are spewing megatons of c o2 into the air and into the atmosphere. one of the things you're seeing is that smoke covering things. people having trouble breathing. t...

The area here. cnn has made repeated attempts to contact black jewel, one of the largest coal producers in the country. but no comment so far. >> all right, keep us posted on that. thank you very much. meanwhile, hundreds of wildfires are raging across eastern russia. the heavy smoke, look at this. it's blanketing cities in what has been described as a toxic haze. fred pleitgen is live there to tell us what is driving all this smoke and fire. what have you learned? >> reporter: hi, alisyn. it is the global climate crisis. that you can literally see, feel, and smell here in this part of the w...

Stockholm. the temperatures are running above where this can be. we talked about paris, setting the all-time record high temperatures. never seen the mercury climb as high as it did. 108 degrees for them on thursday. incredible heat. but that's subsided, the real heat expected across the mediterranean. where we're expected this time of year. we've seen the temperatures soar. and this has set off a series of wildfires across the arctic circle. we are starting to notice the smoke getting wrapped up across russia, alaska, northern canada. and it's made the air very stagnant. you can see this from...

Myhrvold was the long-time chief technology officer at microsoft, trained in physics by stephen hawking, and is a true polymath with interests ranging from physics to food and everything in between. he and his team at intellectual ventures have been working on everything from nuclear power to stopping asteroids from hitting the earth. it's commonly believed that asteroids wiped out the dinosaurs. but myhrvold says asteroid impacts are not just ancient history. take a listen. >> you don't think we pay enough attention to the problem of asteroids. >> so in 1908 an asteroid hit in siberia. it dev...

Myhrvold was the long-time chief technology officer at microsoft, trained in physics by stephen hawking, and is a true polymath with interests ranging from physics to food and math and everything in between. he and his team have been working on nuclear power to stopping asteroids from hitting the either. it's xhenly believed that asteroids wiped out the dinosaurs but he says asteroid impacts are not just ancient history. take a listen. you don't think we pay enough attention to the problem of asteroids. >> so in 1908, an asteroid hit in siberia. it devastated hundreds of square miles. it was h...