The quest for cheap and plentiful meat has resulted in farms where more and more animals are squeezed  into smaller lots in cruel and shocking conditions. Such practices have resulted in  many of the world's health pandemics such as the avian flu. Worldwide, livesotck increasingly raised in cruel, cramped conditions, where animals spend their short live under artificial light, pumped full of antibiotics and growth hormones, until the day they are slaughtered. Meat production is water intensive. 15000 litres of water is needed for every kilogram of meat compared with 3400 liters for rice, 3300 litres for eggs and 256 for a kilogram of potatoes.

What is the most rational and crucial message given by the passage?