narrrrator: on thihis episode of "earth focus," two cities-- freetown, sierra leone, and san franciscolifornia-- continents apart, vastly different culturally and economically, yet facing the same struggle to adapt to rapid urbanization, all set against the backdrop of a dramatitically changing climimate. [film advance clilicking]

narrator: on thihis episode of "earth focus," two cities-- freetown, sierra leone, and san francisco, california-- continents apart, vastly different culturally and economically, yet facing the same struggle to adapt to rapid urbanization, all set against the backdrop of a dramatitically changing climimate. [film advance clilicking] man: oh, no! woman: the red cross says more than 600 people are now missing and that more than 200 have been killed after heavy rain caused a severe mudslide in the west african nation of sierra leoeone. [car horns honking] [insects chirping] amarasekaren: oo oo oo! what's happening? what's happening? no big problem, huh? ok. when w we get proble.. man: whoa!! [men shouting] [indistinct conversation] narrator: while freetown residents fight for acccountability, in san francisco, climate change isn't debabated as mucuch as it's mitigateded. billions of dollars are pouring into the bay area, but is tech-driven development prepared for a sea level that's rising? scholl: san francisco is experiencing a tremendous building boom and has been for the last 5 years