Reallocating wealth to free up resources to focus on the challenges would be pretty straight forward. The IPCC report had a few figures on various techniques we could explore which to me looks “trivial” given the resources we have at our disposal.
The air and waters the world around are contaminated with microplastics, we're not fixing that. We just aren't, that's forever. It's done. All we can do is reduce how much we are adding.
For the carbon sequestration, we don't even have any remotely viable methods for sequestering a gigaton annually. If you happen to know one, YC put a call out for startups in that area last year and I'm sure they'd love you to develop a prototype and pitch them http://carbon.ycombinator.com/
Even of you try and replicate the Azolla event, for carbon sequestration, and you use the 10 largest bodies of water in the world with ideal efficiency you'll only be sequestering about 10% of what we produce and using the 10 largest freshwater lakes in the world (like you know, the great lakes 172,000 square miles of lake dedicated purely to azolla (forgetting it would destroy entire ecosystems) would do roughly 10% of what we need to to combat current emissions under unrealistically ideal conditions.
Nowhere did I imply current emissions could continue.
IPCC estimated up to 2Gt/y for afforestation alone. And their target was at 100Gt until 2100. Given emissions are cut abruptly.
My assumption for trivial was that this is the targets to be reached. That we cease all emissions not directly or indirectly contributing to reaching those targets and align our societies to prioritize this as the highest priority goal (as opposed to producing more worthless junk in order to keep people busy)
You have a trivial technical solution to removing gigatons of carbon from our atmosphere?
You have a trivial technical solution to cleaning up microplastics?
Please, would you kindly share this trivial technical solutions with the rest of us?