In San Francisco, the legal pot business is booming - bringing good times (and some bad) to the masses.

Five years after the unsolved killing of Cissy Chen, her husband, Jack Liu, still lives in the Torbay house they shared before she disappeared.

In the tiny town of Shishmaref, the effects of climate change are among the most dramatic in the world.

In the space of a generation, Qatar has transformed from a handful of poor fishing villages into the richest country per capita.