I always find stories about carbon emissions exciting. The reason why a Malthusian view of things hasn’t panned out in recent centuries is because of technology. I am always interested in if humans can find a breakthrough technology that basically does something with carbon emissions that could eventually be done on a scale to reduce climate change. Unlikely, but fun to imagine.

Here’s an example: https://www.sciencedaily.com/releases/2024/01/240111113214.htm.

I believe I have also seen efforts to convert carbon emissions to hydrogen.

Stuff around making clean water from bad water sources is also pretty cool.