Contrails from jet engines can coalesce and form man-made clouds. These contrail clouds can affect the weather, but their effect on climate change is uncertain.
The Douglas-fir tussock moth is a native to western North America, and its geographic range is coincident with the range of Douglas-fir; both species are found in British Columbia, all of the western states and the mountains of Northern Mexico. Locally, the preferred host seems to be Douglas-fir, for about a decade ago an infestation killed many Douglas-firs on the north-facing slopes of the canyons west of Boulder.
Educational innovation is core to CU-Boulder’s mission. Recent years have seen particularly rapid changes in education in the so-called STEM fields (Science, Technology, Engineering and Mathematics).
Rocky Mountain stickweed (yellow) and brittle phacelia (purple) flowered for the first time in years in the shale barrens near Factory Butte and Capitol Reef National Park.
Mountain chickadees nest in tree cavities. Cavity nests have distinct advantages. For example, cavity nests with small entrances protect against larger predators, such as ravens. In addition, cavities are insulated by solid wood, which not only protects against winds but also serves as insulation against nighttime winter temperatures.
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