Is soy a healthy and eco-friendly meat/dairy replacement?

Is soy a healthy and eco-friendly meat/dairy replacement?

Firstly, what is soy? In case you’re only used to seeing it in the form of tofu, or a processed veggie alternative to meat, soy is a bean from eastern Asia.  They’ve been eaten for thousands of years.  Asians eat them whole or fermented, but in the Western world we...