How many Scientists does it take to sound the alarm before Governments will Listen?

https://www.theguardian.com/environment/2019/nov/05/climate-crisis-11000-scientists-warn-of-untold-suffering

How many scientists does it take before Governments take meaningful action? 11,000 perhaps? Or just continue to criminalise people who sound the alarm? This is real, folks, and it's happening now.