There is a religion called Jainism that actually tries to avoid harming even tiny organisms and plants. As such they avoid eating things like root vegetables that require the entire plant to be killed in order to harvest them.
Interestingly they are not necessarily against drinking milk, as milking an animal is viewed similarly to harvesting a fruit. Though its my understanding that they may still object to industrial milk production.
Yeah, I’m not an expert in construction but I don’t really know what this buys you vs using, for example, insulating concrete forms.