Abstract
Many modeling studies depend on direct air capture (DAC) in their 1.5°C stabilization scenarios. These studies rely on assumptions that are overly optimistic regarding the cost and scaling-up of DAC systems. This can lead to highly misleading results that can ultimately impact the ability to reach climate stabilization goals.
Plant trees to recover diversity. It’s not a solution for carbon capture. Not that it won’t capture a lot of carbon, it will…but what’s now in the air is the product of millions of years of plant capture all released in a century. A completely forested Earth is only a percentage of that, and we can’t and won’t cover that much area anyway. So planting trees is always a great idea, just not to fix this particular problem.
Neither is DAC, but for different reasons. Mainly power use and entropy.