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plastics are now a days used a lot in our day to day life. the following ways are the dangers of the plastics : 
1. they are not bio degradable so they won't decompose easliy. 
2. the plastics if not disposed properly into the soil they will block the porosity of the soil and even it don't allow the exchange of the gases between the soil and the environment.  
3. the plastics will pollute the soil and even our whole environment. 
4. the plastics can only be recycled and used but we con't decompose it as easily we decompose the paper or wet waste. 
5. the plastics once eaten by any animals by mistake will kill them because the plastics are toxic.  
hope so my answer is useful and mark as best if possible :D
Plastics are none biodegradable and hence makes the environment full of waste and burning of plastic evaluate toxic material in air.