"Amazon Tipping Point: 20-25%"
..or even more
In August 2020 the Tipping Point is reached:
In August the next man-made wildfires high-season will start again and by that, the Amazon Tipping Point will be reached.
→ The Evapotranspiration system gets lost (ability to self humidification) 
→ The irreversible loss of one of the largest CO2 sinks on earth and its transformation into a huge CO2 source 
→ Quick enough shut down of CO2 emissions to stop global warming won't be possible anymore 
→ Survival for civilisation won't be possible / extinction of mankind .
"Today 20%": Status of the destruction, see source  of Dec 20th, 2019 "The Amazon is 17 percent deforested, but for the large portion of it inside Brazil, the figure is closer to 20 percent." In addition Reuters reports a "34.4% rise from the same period a year earlier".