One thing we think would greatly reduce Co2 pollution is to bring back the horse and buggy in replacement of motorized vehicles.  Motorized vehicles cause pollution to the environment.  These pollutants cause harm to our health.  They have greenhouse gasses that can greatly affect climate change.  The burning of gas and other fuels creates very harmful byproducts.  They also create Co2 which is the most common human cause of greenhouse gasses (Department of Ecology State of Washington).  Horses are selective grazers which causes them to not eat tougher grasses.  This is because they can not digest them (Extension Horse).  Horses are very important to the environment because it increases the plant diversity in an area.  (Lonker, Fenchner, El Wahed).  Horses are one of the biggest contributors to renewable energy and resources.  They produce up to 9.1 tons of manure every year.  This manure can be turned into green energy.  These farms and other energy companies around the farms can use this energy (Middleton Place Equestrian Center).  Lots of horse farmers utilized trough watering for their animals.  This helps the protection of natural water sources.  It also prevents erosion on the edges of the natural water source (Middleton Place Equestrian Center).  Vehicles are America's biggest air pollutant.  They are producing about one - third of all U.S. air pollution (National Geographic).  Highway vehicles release about 1.5 billion tons of greenhouse gasses into the atmosphere every year (U.S. Department of Energy).  As you can see the horse creates a smaller Co2 footprint than motorized vehicles (Extension Horse).