BBC: The Yasuni National Park in Ecuador is reckoned to be one of the most biodiverse regions on the planet. Beneath it, though, lie an estimated one billion barrels of oil. The Ecuadorean government has begun negotiating with oil companies interested in bringing that oil to the surface, although President Rafael Correa says his preferred option would be to leave the reserves untouched. Earlier this year, Mr Correa announced a one-year moratorium on oil exploration in the area and …