Clemson's onside kick went out of bounds. Coker took a knee and after a two-year drought that felt like eternity in Tuscaloosa, Alabama was back on top. The Crimson Tide became the second team in college football's poll era, dating back to 1936, to win four titles in seven seasons.
The Problem With Monocultures The problem with monocultures, Wetzel said, is that if an insect likes the crop, that insect has a large food supply to draw from all in one place. Conversely, a field containing a variety of plants does not offer a large block of food for the insect, so it will not get the nutrients it needs to survive and thrive.
Many thought that aquaculture held the answer to these problems. Yet, practices differ sharply from country to country, making some types of farmed seafood unsustainable or unhealthy. Salmon, perhaps the most popular type of fish raised in sea farms, poses several problems for the environment and public health:1  The waste from millions of captive fish empties directly into the ocean, polluting the water with untreated sewage, toxic chemicals, and other wastes.roblems With Salmon Aquaculture. Our oceans are in trouble. Uncontrolled fishing has brought many species to the brink of extinction, while pollution from farms, cities, and factories is making other commercially important seafood unsafe to eat.