Climate change: Fact or fiction? | Head to Head

Some scientists say the earth's climate changes constantly and naturally, but the vast majority of them believe the current rise in global temperature is man-made, and could be catastrophic for the planet. But is all this but a case of extreme ‘climate alarmism'? Climate change sceptic Richard Lindzen is challenged on his view that concern about global warming is alarmist nonsense. More from Head to Head on: YouTube - http://aje.io/4a46 Facebook -   / ajheadtohead   Twitter -   / ajheadtohead   Website - http://aljazeera.com/headtohead