nsportation;atal gas ised for largely used for heating and for industrial activity. so until you can show me a plan as part of a national energy plan to transrm our transportation system in the united states to one that uses natural, all right, that argument is speechless. natural gas burns cleaner than any other fossil fuel, but it is not cleaner in its liycudieththat being done an cornell university right now that are gononna be released soon in peer-review journals will show conclusively that the life cycle cost in terrms of carbon dioxide emissin and methane emission from the development of gas from unconventional sources like shale is at least as "dirty" as coal. >> professor ingraffea is also concerned about unregulated fracturing practices spreading around the world. >> not only do we now have a technology that has exceeded our regulatory capacity, we have a government saying something that's ahead of the technology. so i'm really concerned about people in europe, india, asia, africa that are gonna jump into this, again, too soon without dingdomompletely what

i think they're a great alternative mode of ke nsportation just bicycle the city is growing and changing, but i don' like the fact people are riding their bicycles and scooters on the sidewalks. so we need definitely enforcement and we need to make sure when theyoll out again there's appropriate regulations so we all share the road in a fair and constructive way. >> mayorondon breed, i think speak for all san franciscans g when i sayd luck. >>> this week a federal judge approved an $85 billion mergeal etween at&t and time warner. the case had been closely a watched bully weather after are other big corporate deals. it owns directv.t e warner owns cnn and hbo. the ruling was a blow to the justice department which has sued lastovember to block the merger surying it would ht competition and lead to highere pric for consumers. also this week, electric car aker tesla cut its workforce by 9%, the ceo said layoffs would help the company be more profitable. joining me are market watch tech editor and bureau chief jeremy owens. chief technology correspondent ina a federal judge has cleared the er