Every health ecosystem needs top predators. Predators at the top of the food chain help maintain a healthy balance between species and environmental systems. We become keenly aware of this in the ocean when sharks are removed it causes an increase in red tides, toxic algae blooms and a general imbalance to the ecosystem. This effect is called "cascade" or marine trophic cascade when talking about the oceans specifically. However, the cascade can take affect in any environment. The thing about the ocean is that since we, meaning Humans, can't see the cascade directly its the classic "out of sight, out of mind" tragedy of the commons. To help make this more relatable to us land based a simpler example we can all probably relate to:  

• There are more deer in the USA today than in 1800. 
• Meanwhile, deer predators (bears, wolves, mountain lions etc...) populations have been reduced to critically low numbers.
• The lack of predators keeping the deer population in check has incre