What's the most defining work of science fiction of the 21st century?S

New millennium, new science fiction. So much has changed since the dawn of the 21st century, that we've found new works of fiction, film-making and television to speak to our scary new world. But which piece of science fiction from the past 14 years does the most to define our era?

Please post a picture or clip or book cover of the epoch-defining work in question. And then please list the Name, and Why it's Defining. Thanks!

Top image: The Dark Knight. See below for why.