Crear un ambiente distendido en la clase

Crear un ambiente distendido en la clase
 

How can we say in English This? It means to create a good atmosphere. Un buen clima.

I take the English natives will have a better say, but here is my attempt,

To create a relaxed and friendly atmosphere/environment.

To create a "good roads and good weather" atmosphere (?)

To create an atmosphere that puts pupils at their ease/ make pupils comfortable...

(Crear buen rollete, buena onda...)

About the first sentence, would you prefer atmosphere or environment? I asked that because you can say in Spanish "una atmósfera o un entorno agradable", but I think usually we prefer "atmósfera" to "entorno" (in that case). So, I'd like to know if "atmosphere" is preferred to "environment" or not. :thinking:

Yes it is. The environment is something identifiable, such as comfortable chairs and a colourful room. Atmosphere is something less tangible, more like a mood. :)

You could have a tense atmosphere, but not a tense environment.

Mmmmh...? :thinking:
What about if you have 2 tectonic plaques colliding with very high tension...? (Just kidding here... :D Thank you for the data... any further comment or answer to the OP?)