>What if you just want to replace the same amount of energy you get from meat with energy from vegetables? Well, then, to put it very simply, you need to eat a lot of vegetables.

You generally just need to eat the right vegetables. Take beans or potatoes for example - you definitely won't starve when you incorporate the right kind of vegetables into your diet.

Any too restricted diet is also unhealthy, so "to put it simply" just doesn't cut it when talking about diets.

edit:

a bit further down the article, this is stated:

>Update: The researchers did not find that vegetarians or vegetarianism are harmful to the environment, or that producing vegetables is more harmful to the environment than producing meat.