Corporate environmental social and governance (ESG) reporting is becoming subject to increased scrutiny by regulators, investors and public. This dissertation will contribute to several research streams in the extant literature. This dissertation is the first to show the impact of employee environmental values and attitudes on reporting and whistleblowing decisions, making contributions to accounting, management, whistleblowing and environmental psychology literatures. Next, it is among the first to examine the role of the identity of ESG assurance provider in ESG reporting context. Further, it is among the first to examine the impact of SEC assurance mandate and the value of assurance over ESG information, thus contributing to audit literature. Using experimental methodology, I examine how ESG report assurance, ESG report assurance provider, ESG issue type, and environmentalism as a personality factor influence employee decisions to accede to a supervisory request to misrepresent ESG information, to report management's actions to a corporate hotline, to post information about management wrongdoing on social media, to switch jobs, and to judge ESG misreporting actions as unethical. The results indicate that (1) employee personality factor environmentalism impacts their ESG reporting decisions; (2) pro-environmental employees are more likely to whistleblow when assurance is not mandated, and they judge management actions to be more unethical when assurance is required; (3) under pressure to misreport ESG information, employees are more likely to switch jobs and judge management actions significantly more unethical, when they are dealing with quantitative data (as opposed to qualitative data), and when ESG assurance is provided by a consultant (versus an auditor); (4) pro-environmental employees do not differentiate between the issues impacting financial statements or ESG report only, whereas, employees with low-level environmentalism judge management actions to be more unethical when facing ESG issue with immediate impact to financial statements as opposed to an issue impacting ESG report only; (5) older employees (over 35) with low-level environmentalism are more likely to post information on social media when dealing with an environmental issue as opposed to a social issue; and (6) majority of participants (57%) perceive ESG misreporting to be a widespread phenomenon.