What is the best way to translate these terms into Spanish

Hola otra vez!

I would appreciate your suggestions on how to translate the following:

-Procurement rules

-Legal certainty

-Green efficiency investments

Gracias!

Reglas de procuraciòn (to be executed by "el procurador" in charge of "la procuradurìa")

Certeza legal (assuring that laws will not change against your interests)

green is understood as environmentaly friendly
Inversiones ambientalmente eficientes (environmentaly efficient investments)

Inversiones con eficiencia ambiental (investments with environmental efficiency)

Thank you!
This clarifies a lot