I think this in the same vein as "We don't interview a psychic every time there is a murder". If you want the BBC to be unbiased, then you could make the argum

I think this in the same vein as "We don't interview a psychic every time there is a murder". If you want the BBC to be unbiased, then you could make the argument they have previously being biased towards climate change denial, given that a 50/50 interview on TV is not representative of the ratio of scientists who believe/don't believe in climate change.