The world’s countries may have pledged to cut its carbon pollution, but with global emissions reaching an all-time high last year, they’ve fallen far short. Digging out of that hole is going to require removing carbon straight from the atmosphere. But it comes with a hefty price tag, mostly because of the energy required. Removing one metric ton of CO2 using direct air capture is expected to require around 2,000 kWh of energy when the technology is sorted and scaled up. One startup called DACLab...