i'm scott shafer. captioning sponsored by wnet >> sreenivasan: on this edition for sunday, july 30th: tensions continue to rise following the latest missile launch by north korea. in our signature segment, good business: companies committing to employees, environment and community. and, the impact of climate change on the northwest passage. next on "s newshour weekend." >> pbs newshour weekend is made possible by: bernard and irene schwartz. the cheryl and philip milstein family. the j.b.p. foundation. sue and edgar wachenheim, iii. the anderson family fund. rosalind p. walter, in memory of abby m. o'neill.