There are a few more wild tigers than the last time we checked, but Dave and Ol are finding it hard to be cheerful. This week, they ask: is it curtains for the big cat?There's pricey whale sick and an octopus on the lam. And we interrupt Arabella to advise you that perhaps fracking doesn't mean what you thought it meant.Sustainababble is your weekly comedy podcast about politics, prattle and the planet. Out Mondays.Music by Dicky Moore from Bearcraft and Dream Themes.Available on iTunes, Stitcher, Soundcloud, and on sustainababble.fish. Visit us at @thebabblewagon and at Facebook.com/sustainababble