The first thing I learned after viewing the video is that data centers are largely reliant on the electrical grid and account for a significant amount of worldwide electricity consumption. Data centers are among the most energy$-$intensive construction types, with a substantial environmental impact. Data centers, in particular, use $10$ to $50$ times more energy per square foot than a conventional commercial office building. Overall, data centers consume $1\mathrm{.}8\%$ of electricity in the United States. As a result, data centers utilize a lot of electricity. However, data center designs and the capacity to accommodate several tenants make them a more energy$-$efficient choice than the older, traditional on$-$premises servers. As part of their efforts to limit their environmental impact, data centers prioritize four main factors. Data centers' focus areas include greenhouse gas emissions, renewable energy sourcing, power sustainability, and water sustainability.

It also surprised me that greenhouse gas emissions from data centers are frequently quantified in terms of carbon intensity. Carbon intensity is a metric that provides a relative comparison of greenhouse gas emissions characteristics after factoring in a business's scale $($measured by energy consumption or revenue$)$ and emission rate $($measured relative to the main source of energy that generates electricity for the electric grid$).$ Overall, greenhouse gas emissions from data centers are classified into three sorts of scopes:

Scope $1$ includes natural gas $($for heating and fuel cells$),$ diesel $($for backup production$),$ and refrigerants $($used in cooling systems$).$

Scope $2$: Electricity purchases or use.

Scope $3$: Indirect greenhouse gas emissions, including emissions from customers' IT equipment in the data center.

One aspect that is unclear to me is water sustainability. Water sustainability, as far as I understand it$,$ comprises data center projects like reducing potable water use for cooling, on$-$site water purification, rainfall storage, and water restoration, particularly in sensitive locations with severe water stress. Water Usage Effectiveness $($WUE$)$ is an efficiency indicator used to assess the sustainability of data centers' water. Water Usage Effectiveness specifically analyzes how much water a data center requires to cool its equipment. However, I still need more information about water sustainability such as$,$ which types of water we use in the data centers. They do mention on$-$site water purification, rainfall storage, and water restoration. What are the types of water that they would use in data centers? How can they do on$-$site water purification? Please give comment and provide additional insight for this post!