the idea, for example, that you can now take a call on your mac and apple's ted federighi demonstratedhat. take a listen. [ phone ringing ] >> hello? >> wow. hey, it's craig federighi here. >> hey, how are you doing? this is dre. >> hey, doctor, you're on my phone via mac with over 6,000 amazing developers. we all want to welcome you to apple. [ cheers and applause ] >> reporter: so there getting a warm welcome from the 5,000 developers, also just getting word they're previewing the ios 8, the new mobile operating system. that will come with a health app. long rumored, clearly a lot of interest throughout the valley, throughout big tech when it comes to different app.s that can track your health and fitness. no mention yesterday of a wearable, but this would suggest a wearable could be coming in the back half of the year. >> josh, thank you very much. >>> meantime, the obama administration launching sweeping new changes. let's go to john harwood with more. >> reporter: whether you call it a war on coal or on climate change, this administration have been promising for some time since ca