PART I: ALL THE RISK, NO REWARD

We wanted to take a close-up look at three distinct risks: The so-called “bomb trains” carrying a highly explosive gas and oil mix along the riverside from the shale fields of North Dakota to Albany and to Philadelphia; the 50-year-old nuclear power plant at Indian Point, which continues to operate even as its infrastructure ages; and the rebuilding of the Tappan Zee Bridge, currently the largest construction project in North American with a potential to create serious environmental harm if not closely monitored.