

China is slowly transitioning from a developing country, but it’s a slow process as new agreements are signed and old ones expire.
NA and EU wouldn’t be a rounding error, China wouldn’t magically be more powerful than everyone else combined. The EU can already make the US and it’s companies make concessions, that wouldn’t change with China replacing the US.
As far as emissions China already hit the point they couldn’t ignore it. That’s why they are rolling out so much solar and nuclear, the Internet being flooded with pictures of absurdly bad smog already forced that issue.
Israel is a US interest because they are an easier target than the US in a region that tends to prefer terrorist actions.