Jerry Monkman / Logs waiting to be processed into pulp and paper at paper mill, Berlin, New Hampshire, USA

Jerry Monkman / A hydropower dam on the Androscoggin River, which provides power for the paper mill in Berlin, New Hampshire, USA

Kevin Schafer / Windmills generating energy, Altamont Pass, California

Bernard Castelein / Buddhist giant prayer mill in Tashiding Monastery, Sikkim, India October 2007

Jane Burton / European eel {Anguilla anguilla} in old mill pond, UK

Nick Turner / Bliss Mill and Cotswolds countryside with walkers, Chipping Norton, Oxfordshire, UK

Juan Manuel Borrero / Wind mill at Cap de Barbaria on Formentera, Balearic Islands

Juan Manuel Borrero / Wind mill at Cap de Barbaria on Formentera, Balearic Islands

Juan Manuel Borrero / Old wind mill at sunset on the Coast of Hiscaguan, La Palma, Canary Islands

Fabio Liverani / Restored mill house on River Sarthe, France

Fabio Liverani / Mill of Tiscamanita, Fuerteventura, Canary Isles, Spain, September 2007

Yva Momatiuk & John Eastcott / Large windfarm at work on ridge in high desert grasslands with a multitude of turning turbines and a big sky full of cumulus clouds, summer, noon, Wyoming

Yva Momatiuk & John Eastcott / Windfarm turbine at work in high desert grasslands, summer, noon, Wyoming

Gary K. Smith / Burnham Overy Windmill and water mill, Norfolk, UK, february

Nick Turner / The River Eye and the Old Mill at Lower Slaughter, Gloucestershire, England

David Noton / Sturminster Mill on the River Stour, Sturminster Newton, Dorset, England, UK

David Noton / Sturminster Mill on the River Stour, Sturminster Newton, Dorset, England, UK

David Noton / Exmoor from Porlock Mill, Somerset, England, UK

Bernard Castelein / Old man with prayer mill, Nepal

WILLIAM OSBORN / Ruined Penitentiary converted from flour mill in 1854 for convicts, Port Arthur, Tasmania

Jack Dykinga / Timber from felled old growth Redwood trees, Arcata Redwood Company Mill, Redwood National Park, California, USA

Tim Fitzharris / Rhododendron (Rhododendron sp) blossoming at Mabry Mill, a restored sawmill and popular tourist destination run by the National Park Service, Blue Ridge Parkway, Virginia

Tim Fitzharris / Windmill producing electricity at sunset example of renewable energy, North America

Doug Wechsler / Pulp mill pollution, Tacoma, Washington state, USA.

Doug Wechsler / Pollution from pulp mill, Puget Sound. Tacoma, Washington, USA. 1986.

Simon Colmer / Chalk-stream water crowfoot (Ranunculus penicillatus), Mill Lawn Brook, New Forest, Hampshire, UK.

James Aldred / Aerial view of Timber mill and logging camp with huge logs from lowland Dipterocarp trees clearly visible, Sabah, Borneo, Malaysia, 2005

Pete Oxford / Morgan Lewis sugar mill, Barbados, Caribbean

David Tipling / Domestic Water buffalo working to run mill which processes raw sugar cane, traditional farming method, Delhi, India

Yuri Shibnev / Aerial view of industrial saw mill, Verhni Pereval, Primorsky, Ussuriland, Russia

Nigel Bean / Stone water mill for grinding maize, Palas Valley, Northern Pakistan

Jason Smalley / Leicester Mill Quarry (disused and flooded) Anglezarke, Lancashire, UK.

Jason Smalley / Remains of overgrown old Mill on the banks of the river Wyre, Lancashire, England.

Flip de Nooyer / Milled wood planks in a stack, Europe

Gerry Ellis / Windmill farm near San Francisco using propellers and generators as an alternative energy source, California

Michael & Patricia Fogden / Windmill and buildings in village of Cley-next-the-sea, Norfolk, England

Konrad Wothe / Pine (Pinus sp) logs drying before being milled, Sweden

Konrad Wothe / Pine (Pinus sp) logs drying before being milled, Sweden

Tim Fitzharris / Yellow Birch (Betula alleghaniensis) American Beech (Fagus grandifolia) and Striped Maple (Acer pensylvanicum) mixed deciduous forest in autumn, Mill Brook, Vermont

Doug Wechsler / Pulp mill showing pollution. Tacoma, Washington state, USA

Gavin Hellier / Maple sugar mill in Autumn near Woodstock, Vermont, USA

Sebastian Kennerknecht / Houses encroaching into northern coastal scrubland and maritime chaparral, Tamalpais Valley, Mill Valley, California

Barry Bland / Windmill by the water, Norfolk Broads, England, UK.

Barry Bland / Windmill on the coast with moored yachts below, Gullkrona, Finnish Archipelago, Finland.

Mike Read / New Forest pony drinking from the Mill Lawn Brook, Redrise Hill, New Forest National Park, Hampshire, UK, June 2009

Mike Read / New Forest ponies and foal beside the Mill Lawn Brook and woodland, Redrise Hill, New Forest National Park, Hampshire, UK, June 2009

Richard Du Toit / Windmills, Northern Cape, South Africa

Jim Brandenburg / American Bison (Bison bison) herd grazing with wind turbines in the distance, Blue Mounds State Park, Luverne, Minnesota

Kevin Schafer / Windmills generating energy, Altamont Pass, California

Dr. Axel Gebauer / Two men grinding barley with traditional mill stone at watermill, Dargye, Sichuan Province, Tibet, China

Jose B. Ruiz / Mill at the salt mines of Imon, Guadalajara, Spain

Gerry Ellis / Windmill producing electric energy, Colorado

Michael & Patricia Fogden / Reed beds on the outskirts of Cley-next-the-sea, Norfolk, England

Jose B. Ruiz / Traditional flour mill Tarifa Cadiz Andulacia Spain