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Trump Administration Plans to Gut Clean Car Rules
(www.nytimes.com)
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:

How much each change to the atmosphere has warmed the world:

Recommended actions to cut greenhouse gas emissions in the near future:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.
Oil execs, aka Trump's friends. US people have been complaining about how hard it is to find a car they actually want for ages. Their dealership model seems to be geared for extracting money from them, and worse mileage at higher prices would be just more of the same.