Forests, deserts, rivers, and oceans are filled with animal vocalizations and geological sounds. We postulate that climate change is changing the Earth's natural acoustic fabric. In particular, we identify shifts in acoustic structure that all sound-sensitive organisms, marine and terrestrial, may experience. Only upstream solutions might mitigate these acoustic changes. 1 Text From pole to pole, numerous animal species transmit sounds for communication, foraging, and navigation, in particular. Sound is a major element of animal behavior that is used, for example, in territory defense, mate attraction, parent-offspring identification, orientation, prey localization, predator escape. Natural sounds may also come, in part, from plants, initiated both internally and as a consequence of external abiotic forces such as rain, wind, and moving water. Here, we emphasize that climate change is transforming two components of the global soundscapes (Figure 1): biophony which includes biotic sounds; and geophony that groups abiotic, but natural, sounds coming, for example, from running water, wind, and earth movements. Weather properties play a role in the propagation of animal sound in the surrounding environment as sound speed depends on a range of parameters including ambient temperature, relative humidity, wind, and rain intensity. Variations in these parameters can drastically change the range of communication between individuals [1] unusual weather conditions might prevent sound propagation, for example, the temperature might be too high or the air too dry. In addition, there are abundant examples that demonstrate how temperature directly governs the acoustic behavior of terrestrial, aquatic, and marine animals through chemical and physiological regulation, in particular
