Lets assume you use the "Power of the consumer" to only buy products that are environment friendly.

Then you will soon notice that your power does not exist. If you don't have alternatives then thr only option is not to buy. This might work for luxury but when you buy food and there is only heavily plastic wrapped food then you will buy that one.

Also it will be hard to convince all other humans to consume more expensive alternatives.

Especially if the environment friendly alternative is basically cheaper to produce.

Of course you will need governmental regulations on this shit! The system won't fix itself.