Add more relevant laws and sections. Also add relevant case laws to this answer.

Issue:

Is Earth Care, in its capacity as a GreenCo shareholder, able to contest the contact's validity on the grounds of violation of GreenCo's constitution?

Law:

In accordance with s 124(1) of the Corporations Act 2001 (Cth), a company's governing principles, if present, along with any rules that are replaceable, is deemed to function as a contract: between the company and each director and company secretary; between the company and each member; and between a member and each other member.

Shareholders typically possess the right to contest actions that surpass the company's authority or contravene its constitution. Within the company law, as the constitution outlines the goals and restrictions.

Application:

In this instance, GreeenCo's governing principles confines its activities to the manufacture of eco-friendly electronics and associated activities. The agreement with the Municipality of Greendale encompasses plastic and electronics recycling, which appears to be in harmony with GreenCo's goals. Nevertheless, EarthCare's apprehension enters on whether this contract reasonably aligns with the stipulated goals. Ensuring the company functions within the bounds of its governing principals is of legitimate concern to shareholders. The case of Hogg v Cramphorn Ltd (1967) established that the powers of a company, as delineated in its document and sections of alliance, needs to be utilised for the company's benefit. Furthermore, in the Australian case Eley v Positive Government Security Life Assurance Company Ltd (1876), it was affirmed that a shareholder has the right to contest an action of the company if it surpasses the authority granted by the company's governing principals.

Contemplating EarthCare, in its capacity as a shareholder, hold the belief that the plastic and electronics recycling service inadequately aligns with the constitutionally stated goals of GreenCo, its possible that EarthCare could discover grounds to contest the contact.

Conclusion:

Legal precedents such as Hogg v Cramphorn Ltd and Eley v Positive Government Security Life Assurance Company Ltd affirm that shareholders rights to verify that company actions adhere to its governing principals. As a GreenCo shareholder, EarthCare possesses the entitlement to contest the legitimacy of the contact with the Municipality of Greendale if it perceives that the contract surpasses the company's authority or breaches to its constitution.