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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.
How would you control the global population? What carrots and what sticks would you use to persuade and coerce people into a managed population level? This discussion tends to get into some very messy corners, because there's just no properly ethical way to do it.
The earth is an incredibly bountiful place. If we were to stop using up its non renewable resources we would be fine. In terms of space, the population density of earth's habitable land is about 50 people per square kilometre. Compare that with a dense urban area where it's over 10,000 people per square kilometre. There's enough space.
My argument is: yes there are problems with the human race, but attempting to artificially stem population growth is not the answer to them. Providing stable lives for the majority of people globally would be the right place to start.