Barricade:

I don't have time to do my usual exhaustive treatment on this, but I note the following:

1. Green vegetables might have a decent percentage of complete protein in them.  However, the average asparagus spear contains only four calories, so you'd have to eat over 600 of them to survive an average day!  (The resulting energy expenditure and digestive distress are left as an exercise for the reader.) 

Thus we learn the important difference between percentage and absolute amount. 

2. The grains that actually contain enough calories to sustain life don't contain nearly enough protein to meet anyone's needs -- and the protein is of such poor quality (indigestible and lysine-deficient) that it won't sustain life.  There's a reason that people living only on grains suffer kwashiorkor and other protein-deficiency diseases!

3. The only vegetable I know of that even comes close to containing enough complete protein to sustain life and enough calories to make eating it practical is potatoes, at approximately 9% protein that's only a little bit deficient in leucine and lysine.  (Source.) 

(And what do you think happens to that % protein once you add a little bit of fat to that potato in order to make it edible?)

3.5. He repeatedly moves around the axes on his "graphs" in order to obscure the above facts.

4. Beans have a decent amount of protein, but with the exception of soy, it's not complete or of high quality (0.7 or less on the PDCAAS).

5. His "sources" for amount of necessary complete protein in the diet assume 100% complete protein, and are massive underestimations for anyone not completely sedentary.  Your body can adapt in the short term to a wide range of protein intakes without going into negative nitrogen balance, but that doesn't mean you're not losing lean body mass in order to run the basic cellular machinery of survival.  There's a reason raw foodists are stick figures, and the vegans who aren't eating huge amounts of protein powder are either stick figures or skinny-fat...

Result: to get adequate protein as a veg*an, you need to pretty much become a bean-itarian AND be smart about protein combining.  And Bluejay's article is bunk.

JS