Ensuring and promoting environmental sustainability has appeared to be one of the priorities for countries around the globe to mitigate the detrimental consequences of climate change and promote sustainable development of the nations. As a part of the initiatives towards that direction, the Corporate Social Responsibility (CSR) clause has been incorporated in the Indian Companies Act, 2013 making CSR expenditures mandatory for Indian companies subject to fulfilment of some criteria. The study aims to analyse and compare the CSR expenditures of Nifty-constituent automobile companies in India towards environment sustainability by finding out if there exist any significant differences in the CSR contributions made towards environmental sustainability amongst those companies during the period of study from 2014-2015 to 2021-2022. The study utilizes secondary data gathered from the CSR portal of the Ministry of Corporate Affairs (MCA), CSR Box website and annual reports of select companies for the study period. For analysing data on average actual and prescribed CSR contributions of sample companies, statistical tools like, mean, standard deviation, coefficient of variation, etc. have been computed along with visualization of data using bar diagrams and pie charts. Besides, one-way ANOVA has been performed to understand the statistical significance of differences amongst the sample companies on annual average actual and prescribed CSR expenditures during the study period. The study revealed that there exists a notable difference in the CSR expenditures towards environmental sustainability amongst the sample automobile companies during the period of study.