WWF UK's Tanya Steele: 'A fifth of countries are on the verge of ecosystem collapse' Share VIDEO: Sneak preview of Steele's chat with James Murray ahead of BusinessGreen's Net Zero Nature summit this week "A fifth of countries around the world are effectively on the verge of ecosystem collapse," WWF UK's chief executive Tanya Steele tells BusinessGreen. The conservation NGO chief's comments offer a sneak preview of her fascinating recent chat with BusinessGreen editor in chief James Murray about the sheer scale of the nature and net zero crises facing not just the planet, but the economy - and crucially why and how businesses need to make tackling them a priority.