Warning - major digression ahead, but there to explain why Channel 4 have form for totally misrepresenting people who've gone forward to be interviewed in good faith. They're not so much a broadcaster, more a shower of shite.
Melamin: I can't imagine anyone putting David Attenborough in this sort of position in a debate on Global Warming............ Not that this was a debate anyway - scripted set-up.
Actually, Channel 4 did exactly this, not to Attenborough, but to American climate scientist Carl Wunsch (who is a hugely brilliant scientist). Wunsch thought he was being interviewed by a reputable programme. He was careful to explain some of the science in detail - that in previous warming periods, the warming has preceded the rise in CO2 (warmer oceans mean dissolved CO2 is released into the atmosphere), but now we're seeing anthropogenic CO2 warm the oceans, which in turn leads to warmer oceans releasing CO2, giving rise to more warming in a runaway positive feedback loop.
The producer of the programme, Tony Durkin, then selectively edited it so that only the bit I've italicised appeared in the finished programme, making it look like Wunsch believed ocean warming due to random climate fluctuations was causing the rise in CO2 we're seeing at the moment.
In other words, the edit made Wunsch out to hold a position precisely opposite to the one he actually held.
It took ages for Wunsch to force an apology from Channel 4.