we're accompanied by anto, an environmental activist.e knows the local workers and manages to get us through. for the past three years, he's been documenting the devastation. >> everything burnt down here in march. there was smoke everywhere. the trees had been felled just before it happened. >> the method is always the same, he explains. once they've been felled, the trees are stacked up, dried and then set alight. anto shows us evidence left behind by the arsonists a few cans of fuel and a makeshift hut. >> they remove all their machinery before they start the fires. i don't know exactly who it was but they did what they set out to do and left their tent. >> slash and burn forestry is an environmental disaster. the peat swamp forests contain huge amounts of stored carbon, so when they burn they release vast quantities of carbon dioxide. their soil isn't even suitable for palm oil plantations, so canals have been laid to drain the ground. a practice that accelerates the greenhouse effect. more than three quarters of tripa's 60,000 hecta