One of the most obvious signs of depleting food sources are the fish shortages much of the world is already experiencing.

Today, Aug. 13th, marks Earth Overshoot Day, also known as the day when humanity's annual demand for goods and services officially exceeds what the planet is able to regenerate. That’s six days earlier than it was last year and four months earlier than it was in 1987. According to the opinion of many experts, if we…
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NASA ESA
via Wikimedia Commons
Actually, the only to to REVERSE the effects is to go vegan. Join us!
vegans may actually be partially responsible for widespread deforestation to grow more vegtables. Where sustainable farming methods are not enforceable. like the amazon, the congo. palm oil plantations...
regardless of what you eat, if it is not done i n a sustainable way, we won't have it or it becomes contaminated. The way we treat and kill animals must change, just as much as our ways of farming vegtables must change...nutrients of many foods are already so low, that even if you do eat enough food, your still starving...which might be a reason for over eating....