The bed of the northeast Pacific Ocean is covered with a "carpet" estimated to be worth a staggering ten million dollars. These manganese nodules—the bumpy carpet—are rich not only in manganese but in the key strategic minerals: copper, nickel and cobalt. NOVA examines the debate about who owns them and who has the right to exploit their use.

Some day hydrogen may replace the gasoline that we are now using up so rapidly. NOVA looks at the potential of hydrogen as a zero-pollution fuel.