The World Health Organization has called for urgent action to protect the drinking water of more than 70% of the world’s population.
That includes all parts of the globe, not just North America, and the agency has said the world needs a system that is more resilient than the systems currently in place.
Here are five systems that could make life easier, and a few that are still a little rusty.
Aquifer systems One of the most important systems in the world, the aquifer provides drinking water for nearly 70% or more of the earth’s population, but the aquifers it holds have been shrinking for decades.
This is the subject of this week’s episode of the BBC World Service’s The Science Show.
As well as being an important source of drinking water, the river system also provides a major source of pollution, and its failure would have catastrophic consequences for the planet.
Here’s what you need to know.
What is the Aquifer?
The aquifer system is the world´s largest water reservoir, covering an area the size of France.
It is about the size and shape of Britain.
In the late 19th and early 20th centuries, farmers used a mixture of water from rivers and groundwater to irrigate crops.
Water was pumped from the river to a reservoir, then returned to the land to be used again.
The amount of water used per hectare in a year varied from region to region, but it was generally enough to irrigates about 30% of all farmland in the region.
However, as the number of people increased, the water used increased and the land became polluted with heavy metals, which leached into the water, leading to an increased risk of disease.
This caused an ecological crisis, as water and other pollutants were being diverted away from food crops.
Today, only a few of the aquificas of the Andes region in Chile and Bolivia can be seen from the coast.
The aquifes, which contain about 60 trillion cubic metres of water, are located in three main areas.
In Bolivia, they are located on the south-eastern side of the country, in the country´s Atacama Desert, where they extend southwards to the Amazon.
In Peru, they cover parts of northern Chile, in regions that are more than 700 kilometres south-east of the capital Lima.
In Argentina, they lie just off the coast of Argentina.
Here, the system has been drained to the north, in parts of Argentina, the southern and eastern parts of Chile, and also along the northern coast of Colombia.
In Chile, the area is known as the Central Andes.
It was once considered a major food resource, but its population has fallen from 40 million to around 30 million people in the last 40 years.
Water pollution in the area Since its discovery in the 1960s, the Andean aquifer has been a major resource for the region, providing about two-thirds of the water in the Americas.
It has also been a source of major pollution, with many regions including Chile, Peru and Bolivia experiencing severe levels of salinity, with levels of dissolved metals and other chemicals rising.
Salinity has been measured at over 40 parts per million in parts per cubic metre, which is much higher than any other known source of water pollution.
In addition to the effects of groundwater pollution, the systems are also a major polluter.
Water has to pass through thousands of small streams and lakes before reaching the surface, and these waterways often contain dangerous levels of metals such as arsenic, mercury and lead.
The levels of these contaminants have increased in recent decades, and are still rising.
In 2010, researchers from the United Nations Environment Programme found that pollution from the aquified rivers in the central Andes has led to a significant increase in the mortality of fish and amphibians, as well as a decline in amphibian species, particularly in the areas where these waterways are being drained.
In recent years, the US has been the most active user of the system, and it uses a mixture in the form of nitrates, phosphates and salts to control the levels of water in rivers, to help control the algae blooms and prevent water erosion.
Water quality The quality of the groundwater in Bolivia is generally poor, and has led researchers to believe the aquiline aquifer may be one of the main causes of water quality issues in the Ande region.
There are two main types of aquifecycles in the aquidegnet, known as lithosphere and lithotrophy, and both are linked to salinity.
The lithosphere is the water column that surrounds the central region of the continent.
It contains about 70% saltwater, and can be found in many rivers and lakes in the western part of the basin, such as the Rio de la Plata, the River Amazon, the Rio Negro and the Cacique.
The surface water is more alkaline, and contains salts,