Huge areas in the Amazon rainforest are illegally logged to clear land for soya plantations © Greenpeace/Beltra

Some good news just in from Brazil, where soya traders have reinforced their commitment to boycott soya grown in newly deforested areas of the Amazon.

Clearing-cutting to make space for new soya plantations has been one of the main causes of rainforest destruction in recent years, which is why we campaigned successfully for a moratorium (temporary ban) three years ago.

We've got a message for the leaders of the richest nations in the world who are gathering here in London for the G20 meeting to discuss the global economic crisis - put the climate and people first.

15 activists unfurled this 50m x 30m banner from the bridge at the Guanabara bay in Rio de Janeiro, Brazil.

One of the great things about working for an international organisation is that my inbox is constantly filling with emails from around the globe detailing what other Greenpeace offices are working on. A thread I've been following particularly closely is the stream of messages coming from the Arctic Sunrise which is currently back in Brazil on a two-and-a-half month tour of the country.

The purpose of the tour - which goes under the name of 'Save The Planet Now... Or Now!' - is to highlight the important role Brazil (as the fourth largest emitter of greenhouse gases on the planet) can play in fighting it in the lead-up to the UN climate change negotiations in Copenhagen this December.

The challenges of monitoring the effects of deforestation on the Amazon are immense. The vast areas which need to be covered means it's difficult to keep tabs on what's happening on the remote fringes of the rainforest and news of illegal logging and other environmental damage can take a long time to reach the authorities, if they find out at all.

To help solve this problem, the Greenpeace team in Brazil has been training local people to map the impacts of the soya industry in the Santarém region of the forest, the heart of soya production in the Amazon. It's a collaborative project with Brazilian organisations Projeto Saude e Alegria (Health and Happiness Project) and the Rural Workers Unions of Santarém and nearby Belterra, training people to use GPS technology to pinpoint the damage caused by intensive agriculture, empowering them to help defend their land and the rainforest.

If you haven't had your fill of news from the Amazon lately (we've recently had live webcasts and slideshows from regions where fires have swept through), Monday's edition of Panorama is dedicated to the largest rainforest on Earth, and Greenpeace will featured.

Called Can Money Grow On Trees?, it will examine how the rising cost of food is threatening the Amazon as more forest is converted into farmland for cattle ranching - the current dry season provides an excellent opportunity for a bit of fire-based forest clearance. Also included will be the question of whether financial mechanisms (like our own proposal) can be brought in to make forests more valuable if they're left standing.

We haven't seen the final programme, but it's on BBC1 at 8.30pm, with a repeat on Friday 12 September at 12.45am. Of course, you can watch it at anytime on the wondrous iPlayer after transmission (although only if you're in the UK).

It's currently the dry season in the Amazon and, as the live webcast last week demonstrated, fires have been decimating large areas. The video crew weren't the only ones documenting the fires and last week we received images from another Greenpeace team who took to the air to photograph them and the devastated areas they leave behind. We've put together some of the most striking (not to say depressing) images into the slideshow below.

On Friday, a Greenpeace team broadcast a live webcast from the heart of the Amazon rainforest, in an area which was still-smouldering after a recent forest fire. Even rainforests have dry seasons and during the current one, fires both natural and man-made are devastating huge areas.

It was an amazing technical achievement but that wasn't the reason they did it - they were there to show how the forest is being cleared for a variety of reasons (in this case, to open up areas for cattle).

I've just returned from a two week trip to Greenpeace's Amazon office where we were discussing future plans to protect the rainforest. The office is based in a city called Manaus which, despite its position in the heart of the jungle, is far from a provincial backwater - with over two million people the city keeps up a frenetic pace, despite the baking equatorial sun and exhausting levels of humidity.

The job that our campaigners, logistics experts and policy thinkers are doing to protect the Amazon biome is simply inspirational. Many of them have made real sacrifices to work there, moving away from family and friends and the giant cities of Brazil in order to work at the front line of climate and forest protection.

Following the success of the soya moratorium extension, illegal and destructive logging of timber is in the spotlight in the Amazon. A new agreement signed in the State of Pará is set to ban trade in timber that isn't from legal and sustainable sources. What makes this ban significant is that almost half the timber logged in the Amazon comes from the state of Pará.

We have some truly excellent news to share about the ongoing campaign to protect the Amazon rainforest. The moratorium on deforestation for new soya plantations and the use of forced labour - which was the result of our McDonald's campaign two years ago - has been extended for another year. The original announcement by the major soya traders in Brazil only ran until this July, but now they've signed up to a further 12 months.