One of the many major pollutants of the environment in this world is the making of steel by the use of fossil fuels.
The industries that are even more of a problem are:
Plastic production to create plastics which replace steel. Uses both fossil fuel for production and content. All fossil fuels are is one hundred percent naturally and organically captured solar radiation energy.
Food production, known as farming, ranching or agriculture as it releases huge quantities of the worst greenhouse gas, water vapor.
Household cooling and landscaping also release huge quantities of green house gas water vapor.
I will stop here as this is a stamp forum, not a forum to debate science nor politics. Since little is discussed about limiting food, cooling water use since it is not politically correct to discuss population control and reduction. But remember, "Water vapor is the most abundant and potent greenhouse gas in the atmosphere. It warms the air by trapping heat emitted from Earth..." Per the US National Aeronautics and Space Administration rocket scientist, not political buffoons and their sheep followers.
So to continue your theme of activities bad for the planet and people here is food production:
Essay as the silos were moved back to better emphasis the cows for issued version.
Please notice that I included example where material was transported thousands of miles using polluting powered ships. Outlaw those and a return to sail power would reduce pollution wouldn't it? That would also be a good way to outlaw polluting airplanes, moving folks and goods again by sail.