Tradies leaving trucks running all day because they aren't paying for the fuel is an emissions source.
Buses idling at stops for tens of minutes at a time is an emissions source.
Target the people that are wilfully wasting resources.
I'm fairly certain that human population has gone beyond what the earth can sustain.
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.