You may never have heard of Cargill, but they are the largest privately-owned company in the world. They also happen to be one of the major culprits in the continuing destruction of the Amazon rainforest, driving deforestation to make room for soya plantations. That soya is then shipped out to Europe for animal feed.

The view of the Amazon from the air is spectacular. A broad river winding its way through dense jungle back to source, giant lily pads sit like stepping stones across its tributaries and above, white egrets floating in the breeze. Dotted along the riverside, people can be seen fishing in canoes or transporting produce down river.

As we revealed in early April, McDonald's have been implicated in the clearance of the Amazon rainforest to grow soya for animal feed and, thanks to the thousands of emails and letters you sent, they're talking to us about how they can get out of the Amazon.