Why do some big successful brands go bust?

Toast is back for a new series, taking a look at the decisions that often left investors burnt.

I'm Sean Farrington, a BBC business journalist. I'll be hearing about the hype.

They're going to do the deal that makes them the most money at that point of time.

And I'm picking what went wrong, talking to owners and employees to ask, what can we learn?

It was being undercut by similar rivals. It just couldn't survive.

Toast. Listen first on BBC Sounds.

Hello and welcome to more or less on the BBC World Service.

We're your weekly guide to the numbers in the news and in life.

I'm John Bithri.

This week we're talking about the world's largest tropical rainforest, the Amazon.

It's one of the most biodiverse places on the planet,

home to an extraordinary range of plant and animal species, tribal communities, and of course

the mighty Amazon River. But it's well documented that the Amazon is under threat from

loggers, miners looking for gold and other minerals, and the spread of agriculture.

Now, though, environmentalists are feeling more optimistic than usual about the Amazon.

That's because the left-wing Alula de Silva has staged a stunning political comeback,

winning Brazil's presidential election.

Brazil is ready to return to its role as leader in the fight against climate change.

We're going to fight for zero deforestation in the Amazon.

Brazil and the world need a living Amazon. A living tree is worth more than a ton of wood

that's been destroyed illegally by people who are only thinking about easy profit at the expense of the quality of life on earth.

...