Green internet of things is important to achieve atmospheric decarbonisation, it is crucial to implement procedures and practices that prioritise resource conservation and environmental protection. However, the growing use of internet of things devices poses a challenge due to their high-energy requirements for data reception and transmission which often leads to rapid battery drain, necessitating frequent battery replacement and consequently these discarded batteries often end up in landfills, causing adverse environmental impacts. This paper examines the environmental consequences of IoT devices' energy consumption and battery disposal and also explores potential solutions and strategies to mitigate these issues. This paper reviews two methods, which have proven useful in measuring energy usage. The study emphasises the importance of adopting sustainable practices in the design, usage, and disposal of IoT devices to minimise their ecological footprint and promote a greener future.