Which option explains the disadvantage of using fossil fuel as energy sources?

Dioxins, furans, mercury, and polychlorinated biphenyls are just a few of the dangerous chemicals that are released into the environment when plastic is burned. Black carbon , a byproduct of burning plastic, is another factor in air pollution.
Complete combustion of CNG and LPG generates carbon dioxide, vapour, and heat, all of which contribute to climate change and global warming but are not harmful in nature.