Researchers have linked dietary data from over 55,000 individuals with data on the environmental impacts of the foods they eat. The team, from the Livestock, Environment and People (LEAP) project at the University of Oxford, found that the dietary impacts of vegans were around a third of those of high meat eaters. They also saw a 30% difference between high- and low-meat diets for most of the measures of environmental harm.
B12 is fed to animals. This is where the b12 comes from. Meat eaters are having their food supplemented also.
There are many plant foods rich in omega 3 fatty acids with good omega ratios. Such as flax, hemp seeds, and chia.
Minerals are common in plant foods, very common. For example, kidney beans and leafy greens.
The idea of vegans diets being deficient in protein is laughable and intentionally misleading. For example, beans on toast is a complete protein source.
These articles are either aimed at college students, greatly misinformed, or shills for animal agriculture.--
As for the health aspects. For anyone with a genuine curiosity for an argument in good faith see https://www.nature.com/articles/s41398-019-0552-0
Jordan's statement on health is very misleading.