Maybe we should start astroturfing right wing political events? When they start spouting nonsense about the climate, boo them.
Climate - truthful information about climate, related activism and politics.
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.
That's harder than you might think; most of them aren't open to the public, or you have to make a campaign contribution.
It's pretty typical for an event held in, say, a factory, to use an audience of ringers instead of people who work there.