Unit 4

 The tipping point: Is the time at which a change or an effect cannot be stopped.

For instance the global warming, is one of the tippint point on the world, and its is affecting us.

Fonts: 

https://dictionary.cambridge.org/es/diccionario/ingles/tipping-point

https://www.youtube.com/watch?v=w5NY4ej5gQo