as much as we want, anytime we want.

It's easy to forget that the quest for this

has been one of the defining struggles of human history.

Civilizations that harnessed water, thrived.

The ones that failed... fell.

Today, seven in ten people on Earth

can count on having running water in their homes.

[man] The water flows from the risers to connecting mains,

and finally through service connections into each building on the street.

[narrator] At least, so they think.

Cape Town. It could become the first major city in the world

to run out of water.

Cape Town, South Africa, is inching closer now to Day Zero.

Just 92 days away from having to shut off most water taps

because of a severe drought.

[narrator] Cape Town is the first major city in the world

to plan to indefinitely shut off its water supply.

Four million people would stop getting running water.

They'd get water rations,

and they'd need to line up at city water stations to get it.

And it's not just Cape Town.

São Paulo, Melbourne, Jakarta, London,

Beijing, Istanbul, Tokyo, Bangalore,

Barcelona and Mexico City

will all face their own Day Zero in the next few decades,

unless their water use radically changes.

There are perceptions that it is there in bountiful amounts

and everyone has access to it because you can turn a tap,

and that's a big problem.

[narrator] In fact, by 2040

most of the world won't have enough water to meet demand year-round.

We're facing a global water crisis and it's getting worse.

We're at a real inflection point where, if we're not careful,

we may actually get out ahead of our ability to manage it.

[narrator] There's no substitute for water.

Each of us will die in just a few days without it.

How have we built a world

where we don't have enough of its most valuable resource?

And as this crisis grows,

what will the new world look like?

[man] Waterways, built by the people

to free the land of the tyranny of nature.

For some investors, what they see in this glass

is liquid gold.

Clean water. Now.

[crowd chants]

-[in Spanish] In defense of water. -[man 2] Water becomes a commodity.

It takes on new value.

People claim it, haul it, treasure it.

[man 3] Dare we take our water supply for granted as we do the air we breathe?

[narrator] Earth is the blue planet.

There's no shortage of water. We have 326 million trillion gallons of it.

Always have, always will.

Water may freeze into ice or evaporate into air,

but it doesn't leave our planet.

If you sucked up all the water on Earth, it would fit into this sphere.

But 97% of it is salty and 2% is trapped in ice at the poles,

so all of humankind relies on just 1% of that water to survive.

When people talk about running out of water,

what they really mean is,

do they have access to that very small percentage?

[narrator] And the answer depends a lot on where you live.

Kuwait is one of the poorest countries in terms of water per capita,

and Canada, one of the richest, doesn't have twice as much

or even ten times as much. It has 10,000 times as much.

But it also matters where the water is.

That 1% of Earth's water that we all rely on,

most of it is underground and really difficult and expensive to get to,

so humans have mostly settled close to surface water, like rivers and lakes.

Around 90% of the world's population

lives less than ten kilometers from a freshwater source.

Hundreds of years ago, when the Aztecs settled on what is now Mexico City,

they saw a giant lake.

These are the last remnants of the canals they made.

When the Spanish came in the 16th century,

one soldier marveled at the Aztec city rising from the water

that seemed like an enchanted vision.

But then the Spanish started draining the lake,

and over the next few centuries that space was filled by people.

Like in most places, surface water in Mexico

was treated as a public resource, key to development.

And since 1950, Mexico City's population has exploded.

It's now home to 22 million people.

I would say some of the most important threats

for Mexico City are related to water.

[narrator] Mexico City gets more rain than notoriously rainy London.

But the lakes that would have collected that water are long gone,

so the city floods.

But they still need to pipe in

most of their water from other parts of Mexico.

Or they pump it from underground.

We've gotten a lot better at accessing groundwater.

But there's a catch.

Those water deposits, called aquifers, have accumulated over millennia

and they'll take millennia to fill back up.

Groundwater is sort of like the savings account,

which it's fine to draw on sometimes, especially when you have a drought.

[narrator] That's not what Mexico City's been doing.

We take out from the local aquifer around 50% of our water supply.

That means that probably we'll lose half of our supply of water

in the next 30-50 years.

[narrator] Sucking up that groundwater has another side effect.

It compresses the soil.

Mexico City is literally sinking.

In some places, as much as nine inches a year.

NASA satellite data shows aquifers in northern India

decreasing by 29 trillion gallons in just a decade.

There are simply more people on Earth consuming more water.

This century, water consumption has increased sevenfold.

And the rain and snow that we count on to water crops and refill lakes and rivers

is getting less reliable.

[Otto] Climate change is making available water much more erratic.

We're seeing areas around the world

that are experiencing much more extended dry periods.

[narrator] But the problem isn't just that there's more people on Earth using water,

it's how we're using water.

Humans need to drink almost a gallon of water per day.

Brushing your teeth, washing your hands typically uses about a gallon.

[flushes]

There goes three gallons.

But the drinking, washing and toilet flushing

of every person on Earth only accounts for 8% of our freshwater use each year.

Most of the water goes to agriculture and industry,

and into the food and products we use.

Let's take a bottle of Coca-Cola.

98% of the water in that bottle

is not what you see in that bottle.

98% of the water is actually embedded in all the ingredients that were grown

to make that bottle of Coca-Cola.

[narrator] 74 liters of water goes into every glass of beer.

A cup of coffee? 130 liters.

Each of your cotton shirts - 2,500 liters.

But nothing has as much embedded water as meat.

Alfalfa is a common ingredient in cattle feed,

and growing a kilogram of it takes 510 liters of water.

An average cow consumes about 12 kilograms of feed a day.

Divided up,

just one quarter-pound hamburger takes around 1,650 liters of water to produce.

The world is eating more and more like Americans.

Higher calorie diets with more meat.

But everyone can't eat like Americans.

There actually isn't enough water in the world.

Water doesn't abide by some of the basic rules of capitalism.

Farmers hardly pay anything for it.

So the true cost of water doesn't end up in the cost of the burger.

Which is why those fast food places can offer you bargain burgers.

[man 1] How can it be 99 cents?

[man 2] For only 2.99. You heard right: 2.99.

[narrator] In most places in the world,

water is treated and priced like there will always be enough of it.

So we end up using it in absurdly wasteful ways.

Arid Southern California uses over two trillion gallons of water a year

to grow alfalfa, which they get from the Colorado River,

hundreds of miles away.

The amount they pay for it doesn't even cover the cost of delivery.

Just a fraction of the water used by South Africa's wine industry

would be enough for Cape Town's taps.

India and China both grow their most water-intensive crops

in some of their driest regions.

But as water gets more scarce, that may change.

The bank Goldman Sachs predicted that water would be

the petroleum of the 21st century.

And private interests, like hedge funds, have started buying up water,

prompting fears that they'll take advantage of scarcity to turn a profit.

And if that sounds like a villain's plot in a James Bond movie,

that's because it was.

As of this moment,

my organization owns more than 60% of Bolivia's water supply.