This chapter, which is in themes, starts with a survey of the rise of environmentalism for the purpose of sustainability. It then evaluates the roles of nongovernmental organisations' (NGOs') self-regulation and government regulation on the need for accountability that ensures sustainability. NGOs' accountability is a way of making sure that stakeholders' social, environmental and economic sustainability are protected and rigorously evaluated. This chapter further examines what the enduring mechanisms should be if true accountability, which leads to sustainability, will be achieved to suggest a holistic accountability that involves downward and upward accountability. In doing so, this chapter utilised the identified five mechanisms that ensure the continuity of world sustainability, which is prima-facie, the objective of funders/donors, beneficiaries/stakeholders and the NGO's loop.