Coffee lovers, alert! A new report says that the world's coffee supply may be in danger due to climate change. In the world's biggest coffee-producing nation, Brazil, the effects of warming temperatures are already being felt in some communities.

You can see the effects in places like Naygney Assu's farm, tucked on a quiet hillside in Espirito Santo state in eastern Brazil. Walking over his coffee field is a noisy experience, because it's desiccated. The leaves from the plants are curled up all over the floor, in rust-colored piles. The plants themselves are completely denuded.

"We've had no rain since last December," Assu tells me in Portuguese, "and my well dried up. There was nothing we can do, except wait for rain."

But the rain doesn't come.

In fact, it's been three years of drought here in São Gabriel da Palha. This region is part of Brazil's coffee belt. Farmers here have been growing robusta — a coffee bean used in espressos and instant coffee — since the 1950s. Assu says he doesn't know what to do.

"To be honest, I don't see a future," he tells me.

"This year I haven't been able to pay my debts," he says. "I owe the bank, but look at my crop — I have no way to pay."

He's lost 90 percent of his coffee crop. And he's not alone. Production of robusta this year is down 30 percent in the state.

"Coffee depends on a lot of water," says Perseu Perdoná, an agronomist with the local coffee cooperative. And coffee plants are already sensitive to temperature. "Climate change is happening," he tells me, "we can see it. Add to that deforestation, which means the ground can't retain water when it rains."

He fears that, in the near future, unless something drastically changes, coffee will disappear from this region.

"This is affecting the production of robusta," he tells me.

But it's not just robusta. A new report from Australia's Climate Institute says coffee production worldwide is in danger because of climate change. It cites a study that says "hotter weather and changes in rainfall patterns are projected to cut the area suitable for coffee in half by 2050."

This could have a dramatic impact on the communities that depend on coffee production. Perdona tells me families are already going hungry in San Gabriel da Palha.

At the headquarters of the local coffee cooperative I am offered, naturally, a cup of coffee made from the beans of local producers.

Antônio Joaquim de Souza Neto, president of Cooabriel, tells me his family has long roots in the area, and this is the worst drought in at least 80 years – basically, since anyone alive can remember.

"The rivers have run dry," he says. "Even in the city, we have water rationing — one day we have water, one day we don't. We never expected this."

He brings out the records of 17 years of rainfall in the region. He says it used to rain on average 1,300 millimeters a year; in the last three years, that number has plunged to just over 400 mm a year.

He says he went to the capital, Brasilia, to ask for help from the federal government, but none has been forthcoming. So farmers have been taking matters into their own hands.

We meet another coffee farm owner, Eliezer Jacob. He tells me his irrigation pond is at only 10 percent of capacity. Coffee is too difficult to maintain, he says, because it needs too much water. So he has been diversifying his crops in order to make ends meet.

As his mother throws fertilizer on peppercorn plants, he tells me he's now growing a lot of things: cocoa, rubber, black pepper, pineapple, tomato, coconut, watermelon, banana, beans. While these crops also rely on water, they provide several harvests a year, providing a steady income.

"If I hadn't done it, things would have gotten ugly," he says.

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