The 11th Hour is a documentary examining the effects of climate change. Produced and narrated in part by Leonardo Di Caprio, the film will hang on that very fact - that Di Caprio has lent his support to what is a worthwhile film - but also one that sadly also has it's weaknesses.

It begins in doom-ladened fashion pointing out how the melting of the icecaps is causing other natural disasters and pointing out that we are overusing the earth's resources with a growing population and that if we are not careful the earth will not be able to sustain the global population growth particularly if we make no attempt to redress the effects of global warming.

Gradually the filmmakers make steps to ensure that the film ends on a more positive note pointing out that we can all do our bit and every little helps, even if it's just a case of changing a socket in the house to take a power-saving lightbulb.

It's a film with good intentions - but it's a pity that at times the footage from the 60s and 70s with interviewees from that period (former head of the CIA James Woolsey and former Russian PM Mikhail Gorbachev, for instance) is just unexciting. You begin to realise that the film has been coined as a project from now, but is really a mixture of old footage and recent interviews (with the likees of Stephen Hawking) to give the film a contemporary feel.

When you begin to suss though that the contributors are for the most part from decades ago, you do slightly resent the fact that you've paid to see a current documentary only to find it's a few present-day celebrities (including DiCaprio) alongside tired footage that's been dusted down and made to appear as if its up to the minute.

Some of the points are intelligently made and need to be learned by all of us and for that reason, The 11th Hour is still worth seeing if you care about the environment. But it feels rather old hat after An Inconvenient Truth even the points it makes are sound if rather obvious ones - wash your clothes at lower temperatures, boil only the water you need in a kettle, switch off the video rather than leaving it on standby, that sort of thing.