Even electric water and space heaters cause air pollution indirectly, because coal and natural gas are burned to produce electricity in large power plants.
(Even electric water and space heaters; cause indirectly; because coal and natural gas are burned to produce electricity in large power plants) (coal and natural gas; are burned; ) (coal and natural gas; to produce; electricity; L:in large power plants)
Even electric water and space heaters coal and natural gas coal and natural gas
cause indirectly are burned to produce
because coal and natural gas are burned to produce electricity in large power plants
electricity L:in large power plants