The recent trend in extreme weather, as seen in El Nino, in the drought in California, and in supertyphoons, has proven that climate change is here and that it can get worse if nothing is done.
Unnatural climate change is caused by excessive greenhouse gases, best represented by carbon dioxide (CO2) from human activity. Though a lot of CO2 emissions come from energy and transportation, food production also contributes greatly to it. In some estimates for example, meat consumption is said to contribute to 18% of greenhouse gases.
A huge chunk of CO2 emissions can be prevented simply by switching to a non-meat diet. The most usual objection to this is that non-meat food is not delicious, and that a non-meat diet is not healthy. The first objection, being a matter of taste, is not a serious one. It can be easily overcome by a change in mindset or by making non-meat foods more delicious. The second objection can be overcome by either scientific proof or by actual experience.
There are many scientific studies that prove that vegetarian diets are healthy. As a vegetarian myself, the common misconception I found is that people think that vegetarians only eat leaves, which might be true for vegans but not for vegetarians. In fact, vegetarians should eat dairy to get their Vitamin B12 and D. The effects of vitamin deficiency can be felt as cognitive impairment which I've personally experienced as reduced test scores and slower math ability while I was a newbie vegetarian. This was easily solved by taking in milk products. But if you're a vegan, then you must take the necessary supplements.
Some people think that vegetarian diets are a relatively new trend. In reality, vegetarian diets have existed for a long time. India has had it for thousands of years and England has already known it since the 18th century, as proven by Adam Smith, the founder of economics:
Smith's biographer Rae even writes that Dr. Joseph Black, the scientist who first documented the properties of CO2, was a vegetarian:
I hope that with scientific and historical evidence supporting vegetarian diets, those who want a more survivable planet can have all the reasons needed to either be a vegetarian or simply eat less meat.
In The Wealth of Nations, Smith talks about the qualities of each major crop, favoring potatoes over oatmeal:
So we can say that, of all the basic plant-based foods, Smith advocated potatoes and wheat the most.
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