In security, environmentally friendly designs are almost always insecure. The reason is that you get all that low cost and energy through tons of integration&#x2F;sharing. This introduces attacks from hardware emanation on up to software issues due to shared resources. The paradigm of both reliability and security is isolation of problems one can&#x27;t prevent. Long story short, that leads to extra hardware in many forms. Means those systems will always use more space and energy.<p>Further, the stuff that&#x27;s easier to verify and more diverse is on the older process nodes. They deliver less transistors and use more power in the same space. However, they&#x27;re cheaper in mask costs, open-source tools can semi-handle them, still diverse in number of fabs, and easier to reverse engineer. So, once again, high confidence and low design&#x2F;development cost = not environmentally friendly.<p>For high confidence systems, it&#x27;s best to just forget about the environment entirely. As if those smartphones weren&#x27;t manufactured from very polluting processes anyway. Their users are just as guilty: just more judgemental. ;)