A bias in a news story can make the information less credible because it's someone's opinion. It can affect the news story because the emphasis would be changed by the caster's opinion on the story.
The collapse of Easter Island's environment led to a collapse of its society. When early Polynesians arrived on Easter Island, they found a remote island with limited resources in the form of large palm tree forests. ... Scientists have proposed several different hypotheses to explain the deforestation of the island.
