Can the Geocaching Community Celebration Event (CCE) 2024 also be used as a CITO?

Can the Geocaching Community Celebration Event (CCE) 2025 also be used as a CITO? So, can you do a litter pick-up at a CCE or a CITO and theoretically talk about 25 years of geocaching and the best moments? For a few months now, we've been running a CITO series where we meet with an…

Can we build a kind of giant sewage treatment plant on every river delta, preventing any more garbage and contaminated water from entering the oceans?

Would it be possible to build a kind of wastewater treatment plant at every river delta that could treat such volumes of water that at least more waste and chemicals would not end up in the oceans? What systems exist that could, for example, purify in the flow?