One building already has electricity-generating windows.
Saudi Arabia's Crown Prince Mohammed bin Salman announced plans today to create a new futuristic metropolis along the country's Red Sea coast with up to $500 billion in funding.
An exclusive analysis shows an increase in legislative activity related to sanctuary jurisdictions, which comes as Trump has pushed back against such designations.
The increase surprises researchers, as child marriage had been considered a largely rural phenomenon.
Anne Hidalgo promises that the world's cities remain committed to tackling climate change.
Nearly a dozen cities in states won by Democrat Hillary Clinton are calling on Congress to investigate whether Trump violated the Constitution.
Lopez-Sanchez's mental illness is the cause of the tragedy, not his immigration status.
The city will be larger than Shanghai, which has 24 million residents.
High levels of dangerous pollution have stabilised in China, but are rising sharply in India and Bangladesh.
Cities resisting Trump's policy could lose monies for pre-school programs, airport improvements, HIV prevention and more.
New York's standards, which bar short-term rentals, seek to root out residential property owners using their dwellings as hotels.
Pokémon Go opens a new conversation for how we are to protect our digital right to privacy.
Writing in Newsweek, Anne Hidalgo is convinced cities can provide a fresh momentum to democracy.
A new photographic series showcases global urban trends.