Those are all ways to reduce the flow of new carbon emissions, but they don't address the issue if the carbon that's already in the atmosphere, which is what they're talking about.
This would be things like more effective carbon capture technologies or sulfur dioxide injection. The point they're making is that just slowing down the rate that new carbon is added or even stopping new carbon from being added at all isn't sufficient to stop the runaway effects.
Never mind that the current regime in the US is on track to actually increase carbon emissions.