 A 2009 study found that a 4 °C rise (above pre-industrial levels) in global temperatures by 2100 would kill 85% of the Amazon rainforest while a temperature rise of 3 °C would kill some 75% of the Amazon.Deforestation in the Amazon rainforest region has a negative impact on local climate.It was one of the main causes of the severe drought of 2014–2015 in Brazil.