most of the time we just ignore it or deal with it by using an umbrella, snow boots, or suntan lotion. but in recent years, weather patterns have changed in ways environmentalists say we can't ignore. emily explains. >> planet earth is more than 4 1/2 billion years old. and we humans have only been in the picture for a few million of those years, which is just about a finger snap in geological time. and yet, in that short finger snap, we may have caused more damage to our environment than what was done in all the eons before we built our first fire. to learn more about this, we turn to an expert in the field climate scientist dr. radley horton. welcome. >> thank you. it's good to be here. >> what's the difference between climate change and global warming? >> climate change and global warming are two words for the same thing, basically. but climate change is a better descriptor because, as greenhouse gas concentrations are going up in the atmosphere due to our activities -- our burning of fossil fuels -- we are seeing global warming. we are seeing temperatures go up. but we're seeing a

lift to the ecosystem where they could supply things like snow shovels in the northeast maybe suntan lotion customize it to the local geography. >> the head of whole foods was interviewed in "businessweek" last week and he said these kinds of things google express, amazon fresh are going to be their waterloo. was that overstateing it? >> i don't think so. they're doing it prudently and coming in at low cost not buying the company overall. they will take over some of their leases doing it prudently. you've seen them test and see where the returns have been particularly on the fresh product, doing local groceries, market by market see how it goes but it would make a lot of sense as they push towards the same day delivery concept to have it at least in the urban areas. >> what would it mean for investors so impressed by amazon as latest quarter, the profit margins, the profits which they hadn't seen in a while? does this help amazon with the cost issue? >> we still think there's a lot of cost in front of amazon when you think about their growth internationally and the density of their capex th