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Wolsingham, Weardale: swelling buds signal the hydraulic forces that have been building inside trees

The dead leaf on the sycamore stump opened its wings and revealed itself to be a comma butterfly (Polygonia c-album). Their orange pattern was a little worn after a long winter’s hibernation, but still glowed like hot embers in the spring sunshine.

As I watched, it dipped its proboscis into a river of leaking sap, trickling down a leafless, broken twig. It had found a convenient nectar substitute and showed no inclination to fly away. With few wild flowers out, this was most likely the best energy source available. The twig must have been leaking for several days; some sap had solidified into a white crust, but still it trickled downwards and dripped on to the soil.

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In the aftermath of fires or logging, conservation needs to focus on recovering the health of the remaining vegetation, not just the size of the forest or woodland. Ayesha Tulloch, DECRA Research Fellow, University of Sydney David Lindenmayer, Professor, The Fenner School of Environment and Society, Australian National University Hugh Possingham, Professor, The University of Queensland Licensed as Creative Commons – attribution, no derivatives.

New target equates to an effective level of rooftop solar PV installations of 1140MW in 2018 plus approximately 67,000 solar hot water systems.

ACT says it won't be bullied on the NEG by Coalition. “We need to get a good outcome, not just any old outcome," it says - just as the Coalition's hard right warns against any slippage in the NEG's proposed stifling of renewables.

Science, culture and storytelling ...with the spice added. We're back and weekly in 2018.

SunSPoT, a new online platform that can be used to calculate the solar power potential of any rooftop – home, business, factory or school – to be launched today in Sydney at UNSW.

Rooftop solar installation boom continues in March, and total for first quarter is more than one third more than the previous record as households and business respond to soaring grid prices.

Genex looks to add 150MW of wind to its solar and pumped hydro project, creating the "holy grail" of a major renewable energy project with reliable, dispatchable power - and a lot cheaper than coal.

Genex looks to add 150MW of wind to its solar and pumped hydro project, creating the "holy grail" of a major renewable energy project with reliable, dispatchable power - and a lot cheaper than coal.

Australia’s first chauffeur-driven Tesla service, Evoke, has surpassed more than one million kilometres of zero-emission motoring by transporting passengers in its electric vehicles.

Australia’s first chauffeur-driven Tesla service, Evoke, has surpassed more than one million kilometres of zero-emission motoring by transporting passengers in its electric vehicles.

Scott Morrisson is right to dismiss new coal generation as uneconomic, but his estimates of existing coal costs is half what NSW back coal generators charged for off-peak baseload this past winter. It is time the Coalition stopped kidding itself.

Scott Morrisson is right to dismiss new coal generation as uneconomic, but his estimates of existing coal costs is half what NSW back coal generators charged for off-peak baseload this past winter. It is time the Coalition stopped kidding itself.

The supply of California Carbon Offsets (CCOs) is forecast to balloon over the next few years regardless of looming post-2020 limitations on their use, according to analysts.

100-megawatt Redstone Solar Thermal Power Project in Northern Cape, with 1,200 megawatt-hours of energy storage, will reliably deliver non-intermittent power to South Africa’s electricity grid – even well after the sun has set.

100-megawatt Redstone Solar Thermal Power Project in Northern Cape, with 1,200 megawatt-hours of energy storage, will reliably deliver non-intermittent power to South Africa’s electricity grid – even well after the sun has set.

LGC market endured a mundane March, but the small-scale market was abuzz with activity and speculation surrounding the target for 2018.

LGC market endured a mundane March, but the small-scale market was abuzz with activity and speculation surrounding the target for 2018.

Costa Rica already has close to 100% renewable power for electricity. Its newly elected president now promises to replace petrol and diesel in the transport system.

Costa Rica already has close to 100% renewable power for electricity. Its newly elected president now promises to replace petrol and diesel in the transport system.