Caps do not appear to be larger or heavier than before but what do I know.

You could have spent 10 seconds googling this before typing all that. They literally do.

Your comment on CO2 makes no sense

You do know manufacturing is a major contributor to CO2, right? …right?

https://www.politico.eu/sponsored-content/more-plastic-more-carbon-more-cost-why-attached-bottle-caps-are-not-the-way-to-fix-waste/