by making irrigation water unusable. also with us, sam malone manager of education for frac tracker that's an organization that compiled data on the location of fracking wells across the country. she is the executive director of the pro fracking group, energy makes america great. and here with us in studio, thomas of the environmental working group, thank you to all of you for being here. so i'd like to start this conversation, from the premise thiothece for a while, fracking in the united states isn't going anywhere. so with that in mind, is it possible to be more selective about what is done and where it is done, to satisfy the health and environmental concerns of communities. and sam, your organization tracks the location of fracking sites across the country how many are there, and what percentage of those would you consider to be controversial locations. >> it's very difficult to tell exactly how many sites have been hydraulically fractured. and most of those are having stimulation using things like hydriodic fractur