Green computing aims to reduce the environmental impact of computing through efficient use of resources. It involves adopting policies that minimize the carbon footprint of IT setups and operations. Green building refers to environmentally friendly and efficient structures that use resources sustainably throughout their lifecycle from design to demolition. Eco-ATMs allow consumers to securely recycle old electronics, helping retailers by bringing in shoppers and reducing e-waste. Microbial fuel cells generate electricity through microbial oxidation, while solar airplanes are powered solely by solar energy panels. Hybrid and electric vehicles reduce emissions through electric assist or by running entirely on batteries charged by electricity. Overall, green technologies aim to develop sustainable solutions that reduce environmental impacts.