from 16 to 48. investigators believe that this is an isolated incident. very turn now to the dire warning about the amazon rainfore rainforest. top scientists say it has reached into a tipping point where it could turn into a savannah, a grassy plain with few trees and release billions of tons of carbon into the atmosphere. joining me now is kendra pierre lewis. thanks for having me. how bad is the situation right now in the amazon in what are some of the main causes for this. so it s really bad based on this editorian. the big driver is human deforestation. so the amazon makes its own rain because of the shear size of it but as you cut away at it it s less able to zak that zone rain so it will start getting drier and drier, and you end up with a savannah. people think of the amazon as