The scientists in this study wanted to know if cars parked in shady parking lots emit fewer gases than cars parked in sunny parking lots. If that is the case, it would give people another reason to plant trees in parking lots, especially where the climate is hot. Note: In earlier Natural Inquirer articles like this one, the Discussion section is called “Implications.” Topics: Active Forest Management, Pollution, Cars, Climate, Energy, Energy Transfer, Evaporation, Fossil Fuels.