Sydney and most of the country's south-east are in for a sweaty few days as a hot air mass sweeps across southern Australia.

Southern Australia is likely to get its biggest blast of heat since last summer.

It takes a discerning ear to pick an out of place insect call on a evening stroll through the bush.

The tallest species on the planet is much rarer than previously understood.

• EXCLUSIVE

The Turnbull government is sitting on advice that an emissions intensity scheme would make electricity bills cheaper.

Energy giant Santos has relegated its billion-dollar Narrabri gas project to a "non-core asset", stoking speculation the company plans to sell or spin off the venture.

Donald Trump will pick an ardent opponent of President Barack Obama's measures to curb climate change as head of the Environmental Protection Agency - a choice that enraged green activists and cheered the oil industry.

• COMMENT

The irony of the hysterical attack by some MPs is that by ensuring the scheme isn't on the table they are likely to further aggravate the problems they describe in doomsday language.

A leading climate researcher, unceremoniously dumped by CSIRO, has landed a new role.

Humans' closest animal relatives trounce us at: recognising each other's butts.

As the Coalition backs away from a pledge to consider a climate change policy that the energy industry says it needs, a new study is projecting a rapidly growing mass electricity generator for Australia in the decades ahead: the public.

The lightning storm that swept NSW on Monday night saw lightning strikes injure several people and take the life of one man camping near Murwillumbah.

Victorian govt hires Canberra's 'Mr Renewables' as clean energy advocate

A southern elephant seal has given birth in Western Australia - only the third recorded time it has happened in the state's waters.

Currumbin Wildlife Sanctuary on the Gold Coast have shared a video of their two koala joeys playing on the ground, an unusual behaviour rarely seen in the wild.

A man has been struck by lighting, several homes damaged and transport services overwhelmed during a severe thunderstorm that passed over Sydney early Monday evening.

Brisbane City Council's storm early warning system mistakenly sent wrong texts to subscribers last month telling them their homes would be flooded.

Green Army's demobilisation is just the latest retreat since 2013, ACF says.

The first full week of summer is set to be a warm and sticky week for Sydneysiders, with scattered showers and storms expected throughout the week.

The organiser of an initiative which has cleared tonnes of plastic from in and around Queensland's Whitsunday Islands says she couldn't have done it without an army of volunteers.

Reports that Beijing's already notorious smog contained bacteria with antibiotic-resistant genes spread through the city last week like pathogens in a pandemic disaster movie.

A lone tree in a paddock might seem like a paltry habitat for native animals but Canberra scientists have shown how critical they are using an unusual method.

State and city governments worldwide are leaving their federal counterparts behind on climate change.

Heatwaves cause more deaths in Australia than all other natural hazards combined so authorities should consider a cyclone-like rating system to help people prepare for hot spells, a risk researcher says.