The Trump administration is preparing to roll back Obame-era environmental safeguards as Scott Pruitt prepares to take head up the Environmental Protection Agency.

"All the arrows are pointing in a very bad direction," says Danny Price, who sits on the government's Climate Change Authority.

Large hailstones as wide as 50¢ pieces lashed Sydney on Friday afternoon as severe storms hit the city.

Boston: Woolly mammoths - or, at least, animals with very similar DNA - could be brought back from extinction within two years, say scientists behind a ground-breaking resurrection project.

Labor's climate change spokesman Mark Butler has dismissed as "rubbish" widely circulating claims that Federal ALP had dropped its goal of achieving half of the nation's electricity will be supplied by renewable sources by 2030.

The amount of oxygen in oceans around the world has declined, a long-predicted result of climate change, scientists have revealed.

Lake Dumbleyung in WA's Wheatbelt is where Donald Campbell broke the world water speed record in 1964 in his iconic 'Bluebird' speedboat.

Unusually warm sea temperatures and the prospect for more to come have reef scientists worried that the Great Barrier Reef may experience another major coral bleaching event. And Sydney is also under threat.

• INVESTIGATION

It's the fight that has become the proxy war between the pro and anti coal forces in Australia and it's entering its fiercest round.

The booming market for home storage could be thrown into disarray if proposed safety guidelines force owners to move their battery units outside.

Fossil fuels will be, by far, the predominant factor in the early deaths of Australians by mid-century.

Thousands of bats have dropped dead from the heat, falling from the trees as scorching conditions enveloped parts of NSW at the weekend.

Scientists have discovered the presence of chemical pollutants in some of the ocean's deepest trenches, previously thought to be nearly untouched by human influence.

Sydney and much of NSW will take a rare break from this summer's extraordinary run of warmth, with a day or two of milder conditions before temperatures and fire risks start to climb again.

• COMMENT

Consumers are voters and they won't forget who is to blame if there's a meltdown in our nation's energy supplies.

Meteorologists were predicting NSW would set a state-wide record for February warmth during the current heatwave but few would have tipped the mark would be broken two days in a row.

A small town in central western NSW has been "all but wiped out" in a bushfire that ravaged the area, a resident claims, as firefighters continue to battle more that 80 blazes burning across the state.

Former Republican congressman Bob Inglis knows something about the cost of climate change. It included his job.

NSW is facing the "worst possible fire conditions" in its history with a "catastrophic" warning in place across large slabs of the state after a heatwave smashed temperature records on Saturday. 

• Live

Human activity heats up cities to such an extent that on the weekends when we're having a sleep-in, the centre of town is measurably cooler.

Rural Fire Service Commissioner Shane Fitzsimmons said the situation was as "bad as it gets".

Power to the country's biggest aluminium smelter, Tomago Aluminium, will be cut back on Saturday for the second day running as an unprecedented heatwave gripping NSW pushes power reserves to the limit.

Ugly scenes have unfolded at Queensland's Sea World theme park where animal activists ambushed a dolphin show - and then clashed with angry onlookers.

Wayne "Bronco" Lunn has endured many summers in the shearing business in north-western NSW over four decades but he's never seen one like this year's.

• ANALYSIS

Pointing our solar panels in the wrong direction is only one quirk in our strained energy system.

Incessant barking, constant shedding, murderously quick on their feet... Maremma dogs aren't easy, but for chicken farming? They're worth it.

Hundreds more whales have swam into shore at the site of an earlier stranding at Farewell Spit as the tide came in, sending volunteers scrambling.

As Sydney endures another heatwave, sweltering through what is likely to be its hottest summer on record, there are places where the heat is not just extreme but excruciating.