you're going to make me cry. >> narrator: omarina cabrera is on her way to graduating. across the country, thousands of students remain at risk... hidden in the data. >> this will be the biggest environmental fight of this century for alaska. >> a battle for one of the richest places on earth... >> bristol bay is off the charts for wild salmon. >> it is the largest copper and gold resource in north america. >> preserve it or mine it? >> we would be changing a fish and wildlife system into a mining district. >> frontline investigates... >> it will change everything. >> "alaska gold." >> one, two, three. >> frontline continues online. find out what the west philly students and their teacher are up to today. >> and for all the accolades we've received around the technology... >> read about the making of te x prize cars, learn more about middle school 244's unique approach to preventing drop out... >> the fact that she believed in me, i believed in me. >> watch the program again, follfrontline on facebook and twitter, or share your thoughts at pbs.org/frontline. >> frontlin