Lord Lawson has accused David Attenborough of sensationalism and alarmism over the environment.
The former Tory chancellor, who is a climate change sceptic, said the broadcaster's claims about global warming were sheer speculation.
In the final episode of his natural history series Frozen Planet, which is broadcast next Wednesday, Sir David is expected to suggest the Arctic could be free of ice by 2020.
Advertisement - story continues below
Read the whole story at the London Daily Mail.