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Which of your climate actions make the biggest difference? Here’s how to find out
(theconversation.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.
That's one of the things we can do, but there's much more.
When people think of activism, they often envision mass, country-scale protests, illegal blockings, and police brutality. And perhaps obviously, the idea of getting into this kind of activism is scary and paralyzing, especially in a modern fascist society.
But there is plenty you can do that is perfectly legal, not very hard to get into, and will help you cultivate the civil power and responsibility.
Check your local activist groups - someone around you may advocate for more green zones, bike lanes, feeding the homeless, teaching poor children, something of the sort. These actions, when getting enough people, are often approved by the local government, and are completely legal.
With the experience you get, recruit new followers, and advocate for a positive local change. At that point, government is still no enemy to you, and you can work together to make it happen. Contact political representatives and advocate your ideas to them so as to gain their support.
Only then, and only if you're actually set for it and have enough support, you can cross the line into something your government might not like. Mass protests and riots are instruments for when all of the above fails. With enough support, you'll be able to cultivate back the idea that, ultimately, people are sources of political power.
If you don't want to cross the line, it's okay, either! There's plenty to change on a completely legal, government-approved level. Just...get it going. As someone who took part in several local activism projects - they do work. We have successfully reversed several disastrous decisions - straight from the fascist hellhole, while others were giving up. We made the governor of a huge metropolitan area stand in front of us, promising to ban the illegal construction site, make this zone legally protected and improve the park area - and he delivered. Rise up.