oxygen is on fire. it's an international crisis. brazil's space agency says there are 35% more fires burning in the country this year than last, and more than heaalf are in the amazon. macron's comments are being called sensationalist. hen hundreds of temporary firefighters have been authorized. nick paton walsh has more from brazil. >> reporter: extraordinary scenes we saw in three hours above the amazon forest. at times, unable to get low enough towards the forest canopy because of the sheer amount of smoke, making it hard for our pilots to fly. at times, turning off the vents inside the aircraft for our own safety. when we did see the fires, it is extraordinary, exactly how much of the forest they have devastated, and how they rage uncontrolled. often moving in a line simply across the savannah. during our three-hour flight, we did not see one instance of the