1. One should look at countries with a high rate of meat consumption and look to see if the population is dying off. It is especially interesting to note that in many countries, meat consumption correlates with affluence (i.e. the 1% types get lots of steak), and that in those countries, affluences also correlates with longer life.
2. Note that many of the environmentalists and “experts” are people who are vegetarians. Would you trust a frum Jew or a Muslim to discuss the health benefits of pork?