We have started a light pollution survey in the Hungarian national parks. use mobile laboratory consisting of digital cameras and robotic panorama heads to gather high-resolution imaging radiometry. The same type with fish-eye lenses are used fix monitoring stations. Parallel radiometry, we measure spectral distribution sky radiation. spectroradiometry provides additional calibration check on m...

Climate change has driven many organisms to shift their seasonal timing. Are humans also shifting their weather-related behaviors such as outdoor recreation? Here we show that peak attendance in US national parks experiencing climate change has shifted 4 days earlier since 1979. Of the nine parks experiencing significant increases in mean spring temperatures, seven also exhibit shifts in the ti...