The Water Century, Part One: We’re Running Out

An investigation

The WaterCentury

Part One: The ProblemWe’re Running Out

Begin↓

The opening sequence pairs seven short statements with one 3D globe that turns into a chart of where Earth’s water sits: the whole planet, then the roughly 96.5% held in the oceans, then the roughly 2.5% that is freshwater, then that share split into ice, groundwater and surface water, then the roughly 0.007% of all Earth’s water held in freshwater lakes. The final frame closes the sequence by restating the series title, The Water Century, Part One: The Problem, before the article begins. Every figure is in the text, and the sequence reads without 3D graphics.

The Water Century

Part One: The Problem

1.2%

0.007%

ICE<br>GROUND<br>SURFACE

We live on a planet covered in water.<br>So how are we running out?

You’ll be pleased to hear that Earth has no shortage of water.

The kicker is that almost all of it is salty, frozen, polluted, deep underground, or nowhere near the people who need it.

71%of Earth’s surface<br>is covered by water.

It makes nearly three-quarters of our planet blue.

96.5% of thatis held in the oceans.

Almost all of Earth’s water is just a vast, salty ocean.

Leaving only2.5%as freshwater.

This is the good stuff: the water we drink, use to grow food and rely on to support life on land.

Unfortunately, most of that freshwater<br>is hard to use.

Around two-thirds of it is frozen in ice caps, glaciers and permanent snow. Most of the rest is underground. Only a tiny fraction sits in lakes, rivers, wetlands, soils and the atmosphere in forms that are relatively easy to reach.

Ice and glaciers68.7%

Groundwater30.1%

Surface water and other freshwater1.2%

Just 0.007% of Earth’s water<br>is held in freshwater lakes.

And even that still has to be clean, reachable<br>and available when we need it.

The Water Century

Part One: The Problem

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01<br>When we say we’re “running out”, what does that mean?

The planet isn’t an emptying tank

The phrase “running out of water” is useful because it gets attention. Arguably, it should. But taken literally, it gives the wrong picture.

Earth’s water continues to circulate through oceans, clouds, rivers, soils, ice and rock. It’s the water cycle, if you remember your KS2 science. Thankfully, humanity is not consuming the last water molecule and leaving the planet dry.

The problem is narrower than that, and more immediate. Water has to pass several tests before it becomes a dependable public resource.

It has to be fresh enough, clean enough, reachable, available at the right time and close enough to move without absurd cost. It also has to remain in rivers, wetlands and soils in sufficient quantities to support wildlife, land and food production. It’s a really big headache.

That is why the UK can flood in winter and still face severe droughts in summer. It is why a town can sit above an aquifer (the fancy word for an underground “sponge” made of rock) while nearby rivers run low.

Water scarcity is thousands of local systems losing balance in different ways, rather than one global tank emptying at a steady rate.

In practice, “running out” usually means the usable flow is no longer in the right place, clean enough, reachable enough, or reliable enough when people and ecosystems need it.

Water passes through a chain of filters.<br>Choose a stage, or watch the journey once.

All water

Fresh

Clean

Accessible

Nearby

Available now

Affordable to deliver

All water

Every drop on the planet. Oceans, ice, groundwater, rivers and even water in the sky.

Conceptual, non-proportional funnel. The roughly 2.5% freshwater figure follows USGS (USGS).<br>Sources and methodology<br>How Much Water Is on Earth?. NASA Space Place, accessed 2 August 2026.<br>How Much Water is There on Earth?. USGS Water Science School, accessed 2 August 2026. Rounded estimates: 2.5% freshwater; 68.7% ice, 30.1% groundwater, 1.2% surface and other freshwater; about 0.007% of all water in freshwater lakes.<br>Rapid Groundwater Decline and Some Cases of Recovery in Aquifers Globally. Nature, 2024. Monitoring-well analysis; accelerated decline in 30% of the 542 aquifers with longer records.

In short

The planet is not running out of water. The water cycle keeps going, whatever we do.

Water only counts if it is fresh, clean, reachable, there at the right time and affordable to move.

So the argument is really about the small share that passes all of those tests, and that share is getting less reliable.

02<br>Where the Freshwater Actually Is

Freshwater can exist without being practically available

We know from the intro that about 2.5% of Earth’s water is freshwater (USGS). Even that figure can give a misleading sense of abundance.

Only a small share sits in lakes, rivers, wetlands, soils and the atmosphere in forms that are relatively easy to reach.

Groundwater is often treated as if it were one endlessly refillable underground lake....