A light grey wolf stares straight into the camera and looks around.

London, England: Grey smoke billowing across the sky above St Paul's Cathedral.

Medium close up of grey smoke billowing out of factory chimneys and in to the sky.

A thick plume of grey smoke billows into the air.

Whitby, England, United Kingdom: Long shot of a stormy grey sea with foam covered waves in the distance and seafront walkway in the foreground. The camera pulls out to show the Whitby Whale Bone Arch sculpture.

Close up shot of a grey wolf looking around.

Wide shot of silhouetted factory chimneys churning out grey smoke into sky, with clouds, smoke and bursts of sunshine, in Quebec.

Heligoland, Germany: A grey seal rolling on the sand by another seal. It then moves towards the camera.

Thick clouds of grey smoke rising into the sky.

UK: Close up shot of a grey squirrel nibbling rapidly on a nut in a flower bed.

Thick clouds of grey smoke rising into the sky as a volcano erupts.

Thick clouds of grey smoke rising into the sky as a volcano erupts. Rock from the volcano crumbles into the molten lava below.

Thick smoke clouds and flames rise into the sky.

A Zeppelin moves through the sky.

Indonesia: Smoke rising from Krakatoa volcano.

Two horses pull a cart along a street. Old fashioned London buses pass by.

Thick smoke clouds rise into the sky, above an area of buildings.

Two people on a raft are pulled along by a speedboat. They then fall off the raft and into the water.

London, England: Shot of Oxford Street in the early morning when it is relatively empty. A woman walks towards John Lewis department store.

Thick smoke clouds rise into the sky.

Passengers getting off a steam train at a railway station.

Wide shot of hills and dark clouds with pond in foreground. Camera pans to reveal factories and chimney smokestacks churning out pollution.

Wide shot of blue sky and clouds. Camera tilts downwards to show brown smoke rising from factory chimneys and turning the sky yellow.

Stationary view of three cooling towers in a line at power station with smoke coming out of chimneys against cloudy sky , barbed wire fence seen in foreground

Madrid, Spain: A train departs from Madrid's Atocha Station. There are two empty escalators in shot. The station is relatively empty.

Beijing, China: Static shot of the National Theater in Beijing. The building is reflected in the surrounding pool of water.

Thick, dark smoke clouds rise into the sky, above an area of buildings.

Raging torrents of water spill over a waterfall.

A marching band, featuring drummers and pipers, pass along a road.

Madrid, Spain: A train arrives at Madrid's Atocha Station, while people get off another train that is stationary on the platform.

Three old fashioned black cars travelling along a street lined with crowds of people.

London, England: Shot of John Lewis department store on Oxford Street.

An aircraft is lifted through the air by a crane.

Low angle shot of a Zeppelin moving through the sky.

An old fashioned black car travelling slowly along a road.

Raging torrents of water surge along a river.

London, England: Shot of Oxford Street in the early morning when it is relatively empty. Several people stand outside the John Lewis department store.

China: Static shot of the China cityscape. The majority of buldings are skyscrapers.

An old fashioned truck travelling slowly along a road.