One of the factors is a warming of 2 °C, in recent decades, in the surface temperature of the Mediterranean. Answered by María José Estrela, full professor of Physical Geography at the UV.
We call a mirage seeing objects where they are not. It is an optical illusion that can be seen on very hot days and in places like deserts. Inmaculada Pascual Villalobos explains this and tells us about the «Fata Morgana» effect.