Everyone should rethink their meat consumption.
First, if you read nutrition books, you realize that in the long term, it's not healthy. It's much better to eat vegetables.
Secondly, you can get all the nutrients and vitamins you need from whole foods.
Thirdly, it can be cheap. A can of chickpeas is around $1 and it really fills you up for many hours.
I'm not saying everyone should be vegetarian. But if everyone was 70 % vegetarian things would be very different.
He's not against eating meat, but portions should be very low (5-10% of calories from animal products, no more, and this is a veeery small piece of meat). A (near-)vegan diet with B12- and DHA-supplements is the healthiest (DHA can be derived from algae instead of fish oil - the fish get it from algae too). An objection may be: but eating pills isn't natural. Well, eating GMO-fish surely isn't natural either.
If you say, "5-10% of your diet should be meat" you will find your audiences much more receptive than if you say "You shouldn't eat meat". In my case this is because I don't trust extremist anything, particularly when it comes to food.
If the former is your belief and not the latter, please open that way.
I was reflecting the message of Fuhrman MD. He's not saying 5-10% should be, but COULD be meat or animal products (including eggs, dairy, etc). 0% is also fine or even better. He allows this percentage because some people find it too restrictive to be vegetarian or vegan. So optimally you should keep it as low as possible, but there isn't much lost if you still keep it around 5%. Most people don't realize one egg is already that amount. You'd have to eat vegan the rest of the day to stay within limits. Animal products can be used as condiments to flavor your food, not as a substantial part of your diet. If you want to have a look at the scientific data, read his book(s).
What turned me off farmed salmon was this study on chemical contaminants http://www.news.cornell.edu/stories/Dec05/salmon.ssl.html. Key phrases "Consumers should not eat farmed fish from Scotland, Norway and eastern Canada more than three times a year" (for other origins its generally six times).
Its worth noting that you can get wild-fishery salmon too (though generally all Atlantic Salmon is aquaculture).
'Plenty more fish in the sea' as they say. Salmon's unique, sure, but I'd rather buy something I am fairly certain is from a wild fishery.