All these agreements are worthless. The question is, will there be a technology that prevents earth from heating up from burning fossil fuels.
France constructed 40+ reactors for population of 60 million in ~20 years. If we did same everywhere, we could build ~9000 reactors in 40 years. If one reactor would be on average 1000MW, producing roughly 8TWh yearly, we would get 72000TWh from the nuclear power alone. That is about a half of world's current energy production (155,000TWh).
This would be of course a gigantic political and engineering project, but no major new scientific or technical breakthrough would be needed.
To solve this, we need a global carbon tax, probably close to $100/ton. For reference, US emissions per capita is ~17 tons.
This seems... remarkably affordable. For the US, this is less than TARP. We really need to get our act together.