## The Physics of Reversing Entropy
Silicon Valley billionaires view climate change as a software bug that can be fixed by throwing money at giant fans to "suck the carbon out of the air." This is called Direct Air Capture (DAC).
### FAQ
**Q: Why is Direct Air Capture mathematically hopeless at its current scale?**
A: Thermodynamics. Reversing entropy requires massive energy input. CO2 is only 0.04% of the atmosphere. To capture 1 ton of CO2, you have to push 3 million cubic meters of air through a filter. Then, to detach the carbon molecule from the chemical sorbent filter so you can bury it, you have to heat the filter to over 900°C (1,600°F). Heating air to that temperature requires nearly 3 Megawatt-hours of pure electrical/thermal energy per ton. The cost to buy the natural gas or electricity to "boil the air" often exceeds the $150 financial reward companies like Microsoft will pay you for burying the carbon, making the operation permanently insolvent without infinite government subsidies.