Zero-carbon is a term that describes a process, a product, or an initiative that has zero carbon emissions or carbon footprint. However, there are other synonymous terms that provide a similar description. Some of these include carbon-neutral, emissions-free, sustainable, eco-friendly, and green. Carbon-neutral refers to the process that produces zero net carbon emissions after offsetting through carbon credits. Emissions-free refers to a process or a product that does not emit any greenhouse gases. Sustainable refers to processes or products that can be maintained or continued without harming the environment. Eco-friendly is a term that describes products, practices, or policies that have minimal impact on the environment. Lastly, green is a term that incorporates both environmental and social responsibilities, such as social equity, economic efficiency, and environmental protection.