Fair enough, but that strikes me as picking away at the edges of the problem. Maritime shipping represents about 3% of the total.. If research projects can offset that in ways that can be scaled up when we're ready, then that's great. But offsetting 3% here and 3% there doesn't accomplish much when net negative is where we need to be.

We need those projects and we need to describe their results in terms that garner and maintain support. That doesn't mean we should be diverting more than a few percent of our green energy to capture and storage at the expense of rolling out non-carbon energy production and eliminating carbon-based heating (and personal transportation?).

Trees are a lot slower at sequestration than most people think. They are also don't provide long-term sequestration, because they burn or rot somewhere along the line. Given that most existing forests are on land otherwise unsuitable for agriculture, every extra tree we plant takes cropland out of circulation. Without a way to take biomass out of the carbon cycle, it will never be more than carbon neutral.