Starbucks Change management

we have to talk about the company which is starbucks and what the change is (environmental issue /change) Then we talk about the theoretical theory ( articale which I will send 3 change models Koter and kental) describe them and choose one for starbucks then we have to talk about the six phases by dunphy and talk about each phase.Then we have to talk about the s spheres economic social and enviornemtal and its effects on society. Becoming sustainable is how starbucks becomes from undesirable state to a desirable state and which change model we