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The Myth of Plastic Recycling.
(slrpnk.net)
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 a fair concern, but, as you say, concrete is recyclable, and I would expect (though I admit I haven't looked for studies) that it still would be when it has some amount of plastic aggregate. If the plastic breaks down in the concrete, the microplastics should be trapped, and will be reincorporated when the concrete is reused.
Nothing is going to be a perfect solution to plastic, we need to find alternatives to its use, but in the interim it seems sensible to find effective ways to reuse it rather than just dumping it and hoping for the best.
Maybe the best solution was to trap it in our bodies all along! /jk