How climate change can result in low sperm count, extinction of species

Since the 1980s, increasingly frequent and intense heatwaves have contributed to more deaths than any other extreme weather event. The fingerprints of extreme events and climate change are widespread in the natural world, where populations are showing stress responses.

A common fingerprint of a warmer world is a range shift, where the distribution of a species moves to higher altitudes or migrates toward the poles. A review of several hundred studies found an average shift of 17km poleward, and 11 metres upslope, every decade. However, if temperature changes are too intense or lead species to