Hello, I'm Tamasin Ford. Welcome to Business Daily from the BBC.

Spanning more than a million acres, Firestone Liberia, is the single biggest rubber plantation on the planet.

It's being accused of polluting local water supplies.

Local fishermen at Owens Grove, for example, they're saying that there's almost no fish in the

river during the dry season. And they say this is due to fire-stained water contamination

and that their livelihoods are being badly hit.

Bridgestone Corporation, the parent company and the world's largest tire and rubber

business denies all allegations. We take a look at the life of a rubber tapper.

So he just runs from one tree to the other, quickly collects the cup, empties it in the bucket,

and moves on toward the net tree.

And explore these allegations and denials. That's all in Business Daily from the BBC.

Rubber is Liberia's most important cash crop. It accounts for nearly 60% of the country's export earnings.

So, when there are problems with rubber, it's a problem for the entire country. Mighty Earth,

the Global Campaign Organisation, is accusing the country's biggest private employer of polluting local rivers and violating labour rights.

Bridgestone Corporation Firestone's parent company denies everything.

We'll take a look at these allegations in detail in a moment.

But first, let's go to Harbell, home of Firestone Liberia.

Winston Darayu visited the rubber plantation for the BBC back in 2010.

It's approaching May Day now. Across the rubber plantation, the tapas and their help us

are visiting each of the top trees.

From what I see it's like attacks that requires speed, collecting the latex after he has been

topped, so he just runs from one tree

...