Dame Glenys Stacey is charged with the job of keeping the government on track toward a greener future. She talks to Tom Heap in her first interview as the head of the new Office for Environmental Protection. If public bodies in England such as the Environment Agency, Natural England and local authorities fail to keep rivers clean and city air breathable then it will be Glenys Stacey who will try to make them to do better She was a well respected regulator of examinations at Ofqual and has plenty of experience of holding authorities to account, but does she have the powers and budget to keep the government green? Producer: Alasdair Cross