Climate Home: Perched between the mountains and the sea, Rio de Janeiro faces most of the climate threats you can think of.
Beach erosion, favela landslides and tropical diseases -- not least the zika virus -- all feature in its submission to CDP`s city programme.
It is also as ready as it will ever be to host the world`s most iconic sporting event: the Olympics. Just don`t drink the water.
Athletes hope to smash records in the next two weeks, but only in the arena. Some have lent their voices to a campaign...