sayd ismail. this measures gases and gets immediate results. >> take a closer look. purple is the lowest intensity and then it gradual increase of -- gradually increases. red is the highest intensity. we are experiencing even more turbulence and i'm noticing these machines produce lots of heat and as you can see it's nearly 90° in the cabin. nickola blake's station is in the middle of the plane. she willship her samples back to the lab. >> what are we doing with the atmosphere? >> we are using it like a trash can. >> why are you so pessimistic. >> wow, it looks like you guys hit a ton of turbulence and got bounced around quite a built. >> yes, there was quite a bit of turbulence. where there are storm clouds which is why we -- what we are chasing, there is turbulence. we would hit them from 35 feet to 35,000 feet. >> was it worth hitting your head for? >> i would say it was, from what i remember. it's nice to see science with a little edge to us. what you guys saw us doing is targeting on the gulf and the second part of the mission it was about fracking. >> join the

. >> sayd ismail. >> historically is very high.e rate of change is unprecedented. >> why should we care about the levels of co2? >> we are seeing the indication of the forming of the melting of the polar ice caps is one indicator. and figures from now to compared to 20 years ago are slightly higher. >> jack dibb has some eye opening opinions. >> i don't have a rosy outlook on what the state of the world is going to be in 50 or 100 years. there's going to be some progress but i'm not terribly optimistic. >> why are you so pessimistic? >> countries like the u.s. we are potent emitters and not doing much to reduce them. >> dibb says things could get worst. >> these things you read while flying? >> you definitely see stuff coming from asia, coming halfway across from the u.s. or sometimes halfway across. >> back in the air, after about eight hours of one of the most harrowing flights i've ever been on. the er-2 landing is pretty exciting. >> we're in a chase car as the er 2 gets ready to touchdown. >> access to charlie, 1-7 right for r

sayd ismail. >> what you are seeing is the distribution of the ozone. >> take a look.urple is the lowest intensity and it gradually increases with green blue and red. red is the highest intensity of these gases. >> what are we learning about the climate change? >> the amount of co2 hiflt is verhistoricalis very high. >> when phil torrez reports on techknow. 7:30 eastern. if you would like to comment on anything you've seen here tonight, log on to aljazeera.com, tell us what you want to see, in a nightly current affairs program. please join the conversation with us on twitter or at our facebook page. we'll have more of america tonight, tomorrow. >> every summer in america, a force of nature becomes a man-made disaster. some call it a war, millions of acres, billions of dollars. no end in sight. >> in this episode of fault lines, we follow the 2013 wildfire season and ask - with more homes than ever now under threat, what are the real costs of putting them out? >> the fire took a breath and we got our foot on the throat of it and we're going to keep choking it out.