The vast majority of this doesn't constitute a significant portion of the economy or fossil fuel emissions.

I'm not sure how you arrived at that.

Industry is responsible for more than 20% of all emissions. But there's more to that 20% if you throw in what it takes to create any widget sold.

Products don't simply appear on store shelves; there's no such thing as a free lunch. It involves a complex process: raw resources are mined and extracted, transformed into usable materials, and then shipped to factories across the planet. These materials undergo processing and are transported to other locations, where they are built into widgets and once again shipped to store shelves. These items are often owned for as little time as possible and then discarded, contributing to the ever-growing pile of waste generated by consumer purchases.

Each of these steps requires energy, and in many cases, this energy is produced in countries with lax regulations on energy production. Another issue is known as "supply chain sprawl," where logistics and supply chains are spread out due to globalization. This can result in parts being loaded onto large shipping vessels, which are responsible for emitting more than three percent of global carbon dioxide emissions, and then shipped back and forth across the ocean. There are astonishing stories of parts that are shipped across the ocean, attached to a board with just four screws, only to be shipped back to their place of origin before being shipped across the ocean once again for sale. Each of these steps requires electricity and power generation, whether it's for moving ships, manufacturing machinery, transportation, or maintaining the lights. All of these factors add up, some obvious and some less so.

You can choose to ignore it, but you can't deny that it all comes at a cost. One of the most significant reductions we could make in the fight against climate change is by reducing our consumerist habits, as they have been ingrained into our culture by advertisers like Edward Bernays and other psychologists from the Mad Men era, who figured out how to influence the masses and promote consumerism." Think of the dent we could make immediately by just not buying shit and if we have to, buying shit that lasts a lifetime or as long as possible.

under their own motivation

You have never been under your own motivation. Motivation is a hodge podge of multiple contributing factors where many are out of your control. Which is why there is big money in convincing you that you are in control. Its the information age now. They know you better than you know yourself.

A recent book called Buyology, collected findings from numerous studies in neuromarketing, concluding that: subliminal advertising works (and bypasses conscious rational thought or conscious objections), emotional reactions to products can be implanted into the subconscious mind, and increased brain activity during an advert may be linked to an increased desire to buy products.