In the third of the BBC series, ‘Moment of Change’ Katty Kay investigates the hurdles that the Obama administration will have in implementing a successful environmental policy by focusing on global warming and the Chesapeake Bay.

“Take a boat into the Chesapeake Bay and the effects of global warming on Maryland’s 3,000 miles of coastline are everywhere. THis house used once stood back from the Bay, now the water is lapping at its foundation. This island was once connected to this island, which was connected to this island, which was connected to the mainland.”