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Sydneysiders who tossed and turned their way through yet another stifling night can rest assured: relief is on its way on Monday afternoon.

Sydneysiders are sweltering through a hot and sticky Sunday, with temperatures passing the 30-degree mark since 9.30am.

Climate science at the CSIRO is bouncing back one year after executives modelled its demise, securing new revenue streams in the Pacific and China and looking to hire new staff.

It's 5.40am in Moree, northern NSW, as Ben Adams wakes up and prepares for work.

Canberrans who sweltered through a hot and humid Sunday should brace themselves for an uncomfortably warm night. 

Sydney prepares for a hot February weekend ahead of what is likely to be another month of sweltering temperatures.

Early colonists thought weather systems moved from east to west.

"We are all very worried here," Rahmstorf, a professor at the Potsdam Institute for Climate Impact Research, says.

"Clean coal" plants that the Turnbull government has flagged could get clean energy subsidies are more expensive than solar, wind and gas-fired power and would lead to higher electricity price rises, analysts have warned.

As the temperature reaches new heights, so does the sale of air conditioners as Sydneysiders seek out cool relief in their homes. 

We should invest in the future, not sink more public money into last century's technologies.

Australia's top business groups have cautioned the government against making any more changes to the renewable energy target.

Once thought to be aberrant behaviour, cannibalism is common in the natural world - and for many species, not necessarily a bad thing.

Sydney's latest summer heatwave has peaked and temperatures are plummeting - but the relief won't last long as another hot spell will arrive within days.

Sydneysiders struggling back to work and school this week are likely to get little early relief - particularly overnight - from the city's record-breaking heat.

NSW students returning to school this week face extreme heat on Monday and Tuesday with temperatures reaching into the 40s for much of the state. 

The Andrews government will pledge to cut Victoria's greenhouse gas emissions by up to a fifth by 2020, putting it at odds with Canberra on tackling climate change.

It will be a blazing start to the new school year.

Despite record-high temperatures so far this summer, Sydney has avoided serious bushfire over the holiday period - though the Rural Fire Service warns the danger is not over yet.

Sharks have hogged the spotlight this summer. But what about the smaller creatures that inhabit our waters. Fish that can go from being female to male or sea cucumbers that can reorganise the position of their vital organs before splitting in two. They all live in Australian waters: in our bays, harbours and deep oceans.

'Took a bit of practice' to get two shooters in sync, one with contraceptive and the other with marker dye.

A rodeo in New Zealand is to use men dressed as sheep because chasing real sheep is banned.

Meet Taronga Zoo's newest addition  - one of the world's tiniest and rarest primates, a mohawk-sporting baby cotton-top tamarin.

The world's first transgenic ants offer scientists the chance to explore the evolution of animal societies - and, perhaps, our own.

An unusually quiet period for cyclones in the Australian region may come to an end within days.