Plant varieties are essentially inbred, so to get strong but still predictable plants, you need to cross two varieties that have some genetic distance.

The plants resulting from a cross are called F1. F1 seeds are comparatively expensive because of the effort required to make them. (Still, they are very cheap compared to other expenses.)

If the storebought peppers are F1 then their seeds are F2 and will be a random combination of parent traits instead of the perfectly predictable F1.

Another reason to buy seed is that you can grow much more interesting peppers. For instance beautiful purple striped Blot peppers or tasty Jimmy Nardellos.

We still have a lot of roofs that could have solar on them. Scaling up nuclear will deplete fuel mines faster because the isotopes that are legal due to arms treaties are pretty limited.

Unfortunately these people can’t distinguish actual science from bad science or completely made up things that claim to be based on science.

Plastic packaging has issues but climate change is not one of them. Shipping also isn’t impactful at all. Most shipping emissions happen when the product moves to the store, not when it sails in a container ship.

Based on your post, the main evil of the corporations is manipulating the media, confusing people with things like abolishing plastic straws (which are very efficient at what they do).

Eating beef, owning a car and buying unnecessary stuff (for example those bottled drinks) are huge. They easily make up half of a persons emissions. An accurate measure is hard because of secondary effects like needing less road with fewer cars.