Hashem Akbari has a vision of a shiny, happy world.He sees polished roads and cities that gleam in the sunlight.Rooftops are bright and pavements light.

• 本周，科学家们将会发出警告，由全球气候变暖所引起的海平面升高给地球带来的威胁将会比之前预期的要严重得多。