One controversial idea is known as bioenergy with carbon capture and storage, or BECCS: You’d grow crops and burn them for energy, then capture the emissions coming out of the facility and pump them underground as liquefied gas.
To calculate the ROI of tree cover, Kroeger and colleagues from the Conservancy and NASA, set out to identify where it would provide the largest health benefits – the greatest reduction of respirable particulate matter and heat for the highest number of people — and then measure how those benefits compare to the costs of the trees.