Dolphins (like whales) ancestors originally evolved from land animals around the Eocene around 50million years ago the Eocene was considerable warmer than present times see 65 Myr Climate Change chart. Both charts are from Wiki.
Dolphins in the modern form are known in the fossil record from over 12 million years ago and have survived periods warmer than now plus multiple ice ages with attendant sudden climate shifts we could not imagine.
The ABC has this article – Burrunan dolphin deaths linked to Fresh Water Skin Disease caused by climate change – I marvel at the “scientific” conclusions behind this article. One thing certain is that a population as small as numbers quoted is at risk of dying out regardless of changes in rainfall.
Yikes, 50 million years of global cooling and umpteen ice ages thrown in, I am frightened.
A bit like the BS surrounding the imminent demise of the corals, which have evolved over hundreds of millions of years. The fact that they have survived, even thrived, throughout widely varying sea levels, significantly higher atmospheric temperatures and CO2 levels than today seldom even rates mention by our pathetic, alarmist MSM.