Previewing an upcoming story for NBC's Rock Center on Friday's Today, correspondent Ann Curry warned that tribes of the Amazon rain forest "are sharpening their spears and preparing their blow guns to fight Ecuador's new plan to auction as much as 8 million acres of the rain forest for oil drilling." [Listen to the audio or watch the video after the jump] She then cited Boston University biology professor Kelly Swing arguing that "America, a top importer of oil from Ecuador, shares responsibility for this coming conflict....And the toxic legacy of past oil drilling in other parts of the rain...