(micro)-algae can be a really good source of long-chain omega-3's (EPA/DHA), which are otherwise difficult to get in a plant-based diet.
While beans and rice are pretty damn good (or what I tend to do, beans and potatoes) it definitely isn't complete nutritionally and there is pretty important stuff that's missing or there isn't enough of (EPA/DHA, Vitamin D, Vitamin B12, etc).
Variety is also good just because of allergies and oversensitivites to certain foods and even just taste preference. Just about anything is better for the planet than meat!
While beans and rice are pretty damn good (or what I tend to do, beans and potatoes) it definitely isn't complete nutritionally and there is pretty important stuff that's missing or there isn't enough of (EPA/DHA, Vitamin D, Vitamin B12, etc).
Variety is also good just because of allergies and oversensitivites to certain foods and even just taste preference. Just about anything is better for the planet than meat!