Why is it imperative that humans alter their consumptive behaviors and practices to more sustainable ones?

Humans, as we know, are wasteful. We do not take into account how much we pollute the planet with our lifestyles. In order to prevent pollution and waste buildup and resource consumption, we can still lead comfortable lives but use sustainable options for our daily needs.
Examples:
Reusable grocery bags, straws, and water bottles. Eco friendly razors. Naturally produced makeup. Solar power. Rechargeable batteries.
Anything that can last longer. However, as you read this, you might think “but isn’t this bad for companies since you are not making consistent purchases?” Yeah. But it is more efficient for our planet. Sadly, we do not know of these alternatives because we will be spending less and helping more. And companies want you to spend more and more. :(