There's an old saying that elephants never forget. You also can say they almost never sleep.

There is a (figurative) mountain of dead animals rotting in the bush. What we do with them could drive species toward extinction – or help save them. If only we weren't so squeamish.

Pressure is mounting on Labor to rule out adapting a plan by the Morrison government that would effectively halve Australia's emissions reduction effort under the Paris climate accord.

At an American base on NZ-claimed Antarctic territory, a small nuclear reactor was once installed to provide energy and save money. The after-effects are still being felt.

Though temperature records were not broken across the state on Monday as feared, scientists are finding that even a standard summer day presents real dangers in Sydney.

Wildlife rescuers have fielded almost a call a minute, and some services are reducing their hours, as demand soars for help for injured wildlife.

We are still killing off our unique fauna at a horrifying rate.

Unless we take immediate steps, the world will not limit global warming to 1.5 degrees.

I'll give it to you cold. Electricity prices are going up.

Sydney's record-breaking weather juggernaut rolls on, with summer confirmed as the city's hottest for both days and nights over records stretching back 157 years.

"It's been pretty ordinary that's for sure. We broke the record for the wettest summer on record, with 192.8 millimetres of rain compared to 180.4 which was set back in 1955 - and the average summer rainfall in Perth is 35.4, so that's a significant rise."

National weather forecast for Monday May 23.

Hundreds of residents in the Hawkesbury-Nepean Valley were issued emergency warnings to flee as the river surged above moderate levels.

National weather forecast for Monday May 16

Roofs have been badly damaged and cars have been destroyed, but residents are thankful the hailstorm was not worse.

The final weekend of the Australian summer looks all set to be an absolute scorcher with Perth expecting a hot and sunny day on Saturday with the mercury rising to 40 degrees.

The Victorian government is demanding the operator of Australia's main electricity grid explain how the state came close to losing electricity during the recent extreme heatwave to ensure NSW avoided power outages, adding to calls for a wider inquiry.

There is a mysterious hole in Lake Berryessa in California. It is not a supernatural whirlpool, a demon's mouth or a portal into hell or a fourth dimension. The creepy thing probably won't suck you into it either.

National weather forecast for Sunday May 29

National weather forecast for Monday May 30