The "upper middle class" is not strictly defined, but they are pretty clearly the folks below the wealthiest 1%. You can't be in the middle without something on either side.

They certain consume far more than the poor, on account of having resources, but they also consume far less than the wealthiest 1%.

You are almost certainly in the global 1% of the wealthy [1]. Compared to developing nations' residents, we have an order of magnitude greater impact on the environment.

1. https://www.bbc.com/news/magazine-17512040