Man-made changes to waterflow patterns in the area may also have played a role, they believe.

And this helps to improve computer models for forecasting man-made changes in the climate.

Every change, including man-made changes, offers opportunities for life.

Algae blooms and sewage, which are indirectly created by man-made pollution, are visible, and have been photographed, from space.

There are also man-made pollution tree lines in weather-exposed areas, where new tree lines have developed because of the increased stress of pollution.

The salt crystals further contribute to the black effect that man-made pollution has on these buildings.

The structures are a 20th-century man-made pond, a cistern, and a windmill to pump water to the cistern.

The site once included a man-made pond with elevated cyanide levels.

The park contains a man-made pond and more than 1 million trees, many newly planted.

It contains a big man-made pond, a pine forest and several footpaths.

Increasingly, animals there also rely on man-made ponds intended for livestock.

It was, at the time, the largest man-made reservoir in the world.

Had the project been completed, it would have created the largest man-made reservoir in the world.

They are usually found in lakes, rivers, swamps, and man-made reservoirs.

Increasingly, eagles nest in man-made reservoirs stocked with fish.

These areas are often man-made reservoirs or drainages that have been almost entirely monotypic.

Yeah, we can build a beautiful cathedral or a man-made river.

Freshly painted bike lanes curve along man-made river banks.

A five-kilometre boat ride on a man-made river and a five-kilometre wilderness steam locomotive train ride are also planned.

The 140000sqft m2 campus was estimated to have a cost of $74 million and was planned to have administrative buildings, glass-and-steel classrooms and luxury dorms linked by a man-made river.

The site of the village currently consists of three concentric man-made rivers that once surrounded the village.

Water reserves, however, are 'abundant' and there will be enough man-made snow to satisfy the ski jumpers, freestylers and cross-country skiers who would compete here, they say.

The bid organisers promised to draw on 'abundant' water resources to produce man-made snow for the various winter sports events - despite northern areas of the country facing serious water shortages.

This was used to make 4ft m of man-made snow to cover all of the trails used for the events.

Man-made snow was also applied for the cross-country skiing trail.