El Nino are natural weather phenonium generally occurring between every 2 and 7 years. It would appear that as predicted, the El Nino is getting worse as a result of climate change.
This mass die off released carbon dioxide greater than the annual emissions of a country like the UK or Australia.
The fear is that this will become a common event as the planet warms.
The problem is that with this much carbon released, the Amazon as a whole was flipped from being a net absorber toa net emitter of carbon.