The US' biggest polluting sources (i.e. market sector) are energy and transportation (i.e. 100% domestic), and manufacturing/construction and industry come in fourth and seventh (I.e. offset from imports). China's top four are energy, manufacturing/construction, industry, and transportation. So that makes sense, they're an export-heavy country. But if we take a closer look at fuel source, the US is drastically reducing use of coal and leveling off use of oil (replacing largely with natural gas it seems), whereas China is growing in both, and very quickly.

So as China needs more energy, they seem to be building more coal plants. As the US needs more energy, they seem to be replacing coal with natural gas.

Apple has around 20% marketshare in a sector that they invented

They didn't invent it, they claim they did, but Palm and Blackberry existed before iPhone.

Regardless, designs aren't covered by copyright, but by design patents, and those have very limited enforcement, especially for something like a phone where they all kinda look the same. Basically, you need to try to pass your device off as another in order for it to reliably trigger.

Big companies... are abusing the system

Agreed, which is why we need a concerted effort to take back control of the legislative process. IP law reform is one such effort, and it would be a huge blow to large companies.