Large amounts of carbon capture as a solution is an 'illusion'
Large‑scale carbon capture is scrutinized as a potential climate solution, with many arguing that current technologies are too energy‑intensive, too slow to scale, or being used as a pretext to prolong fossil fuel use. Others see carbon removal—whether via direct air capture, biochar, tree plantations, or ocean fertilization—as a necessary complement to aggressive emissions cuts and rapid deployment of cheap renewables like solar. The exchange highlights deep uncertainty over technical feasibility, cost, and political will, ranging from calls for systemic change and strict fossil‑fuel limits to optimism that future breakthroughs and abundant clean energy could make engineered carbon removal viable.
IEA conclusions and credibility
- Some argue the IEA is unreliable, citing its historically poor solar forecasts, so its pessimism on carbon capture should be treated cautiously.
- Others respond that past forecasting errors do not negate the physical and economic constraints IEA points to, especially around energy demand of DAC.
Energy cost and scalability of carbon capture
- A central debate: IEA’s scenario where continued high oil/gas use + net‑zero implies ~26,000 TWh/year for DAC alone, more than current global electricity use.
- One commenter recalculates this as ~16% of total current world energy use, arguing this seems large but not impossible if energy continues to grow and electrify.
- Several note DAC is thermodynamically and materially expensive and will always be costlier than avoiding emissions, but may still be needed for residual emissions and legacy CO₂.
Carbon capture: solution, complement, or scam?
- Many see large‑scale CC as a political fig leaf for continued fossil fuel use, enabled by subsidies and “green” branding.
- Others see it as a necessary but secondary tool: we must cut emissions first, then use CC to handle hard‑to‑abate sectors and excess historical CO₂.
- Concerns include safety (e.g., CO₂ pipeline incident) and opportunity cost versus cheaper mitigation.
Role of cheap solar and abundant energy
- Some argue plunging PV costs and enormous solar resource could eventually supply the energy for massive DAC.
- Others counter that even with cheap energy, materials, siting, and infrastructure scale are major constraints.
Nature‑based sequestration and biomass ideas
- Proposals include mass tree planting, managed tree farms, burying wood, biochar, and “LARPing the Carboniferous” by turning biomass back into underground carbon.
- Limitations discussed: land area, slow rates, decomposition (CO₂/methane release), and logistics/transport emissions.
- Ocean iron fertilization is presented by one commenter as a proven large‑scale solution allegedly blocked by governments; others do not engage deeply, so its efficacy remains unclear.
Systemic, political, and alternative views
- Some argue that focusing on CC without attacking consumerism and fossil‑fuel power structures is misguided.
- Others advocate carbon taxes pegged to DAC cost, bans or taxes on high‑luxury emissions, and simply deploying renewables and efficiency first.
- Side threads include climate‑denial arguments (e.g., volcano CO₂, “CO₂ is good for plants”) that are strongly challenged by others within the discussion.