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Cycling like the Dutch would slash the world’s carbon footprint
(www.euronews.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.
Just narrowing the space for cars and adding continuous walking paths plus protected bike lanes will get you pretty far. The goal isn't that every single person should travel by foot or car every time, it's to make it more common to use those travel modes in general.
And build passenger trains.