 In the Amazon rainforest, an extreme lack of rainfall has reduced some river levels to their lowest points on record. Culprit The World Weather Attribution is a group that studies weather events. It reports that climate change is the main culprit for extreme high temperatures and low water levels in the South American rainforest. In this case, a culprit describes something responsible for causing a problem. More commonly, the word is used to mean a wrongdoer, especially one who has broken the law. Thank you for watching.