Eco-paradox USA: The relationships between economic growth and environmental concern generally, and by different income groups

At the individual level: Wealthier individuals pollute more and favor growth; poorer push protection.

I would have guessed the opposite, since higher income people have the time and means to care about the environment. For example they can afford to buy organic and trade in their gas car for an EV while poorer people would be hurt more by fuel taxes and/or higher fuel prices. Wasn't the yellow vest protest movement in France against higher fuel taxes?

How did the authors define wealthy and poor?