Five prepositions in a sentence examples

1.) we are running in the gym today.
2.) the sun is above the clouds.
3.) she lives near her workplace.
4.) he swam at the lake.
5.) we located the key for the lock.

I think you answer would be 
Because nitrogen oxides are created in the process of burning coal and other fossil fuels, some power plants are changing the way they burn coal. A great way to reduce acid rain is to produce energy without using fossil fuels. ... Renewable energy sources help reduce acid rain because they produce much less pollution. 

I hope I helped