I am a big supporter of having us sign that thing. That said.
Will this do anything? No it won't.
The exclusion of developing nations like China and India (and us) make it effectively nil.
But it is all we have right now. It's a good first step towards actual teeth in a commitment to reducing CO2 levels. Maybe one day soon we can get together with the rest of the industrialized world and impose a tariff against nations that refuse to reduce. But that won't happen unless the USA is a part of the process.
FLSTF: What the sun does and what we get out of it are two different things. We are getting farther away from the sun (on average) for several thousand years now and will continue this for thousands more. It's part of an ellyptical to circular cycle that our planet has. The math says we should be cooling off. Reading the carbon concentrations in our atmosphere, our current temperature shift gels with the stated
energy absorption properties of carbon.