Feed aggregator

Juniper threatened by fungus-like disease is first species to be fully collected in Kew’s Royal Botanic Gardens tree seed project

The future of gin is safe, according to horticultural experts who have collected juniper seeds from across the country to help conserve the declining tree species.

Juniper berries, which take two years to mature slowly on the plant, help give gin its distinctive flavour, but the native UK species is in decline.

Continue reading...

The Amazon rainforest is the world’s largest, but in the last 40 years at least 20% of it has been destroyed. The Amazon basin covers nine countries in South America, with 60% of it in Brazil, and for a decade local photographer Rodrigo Baleia has documented the beauty and destruction of the region from above

Continue reading...

The discovery of the 600 mile-long reef in 2016 stunned scientists but oil companies are planning to drill in the area

The first images have been released of a unique coral reef that stunned scientists when discovered in 2016 at the mouth of the Amazon.

The 600 mile-long reef is expected to reveal new species as scientists explore it further, but oil companies are planning to drill in the area. The photographs were captured from a submarine launched to a depth of 220 metres from the Greenpeace ship Esperanza. Campaigners say drilling must be prevented to protect the reef.

Continue reading...

The research is clear – humans are responsible for all the global warming since 1950

The latest Intergovernmental Panel on Climate Change (IPCC) report – which summarizes the latest and greatest climate science research – was quite clear that humans are responsible for global warming:

It is extremely likely [95 percent confidence] more than half of the observed increase in global average surface temperature from 1951 to 2010 was caused by the anthropogenic increase in greenhouse gas concentrations and other anthropogenic forcings together … The best estimate of the human-induced contribution to warming is similar to the observed warming over this period … The contribution from natural forcings is likely to be in the range of −0.1°C to 0.1°C, and from internal variability is likely to be in the range of −0.1°C to 0.1°C.

Continue reading...

Roger Gower’s brother says he wants something good to come from tragedy after pilot was shot dead in Tanzania

The family of a British pilot who was shot dead by elephant poachers in Tanzania have said they want to “make some good come from tragedy” as they spearhead an appeal to raise £1m to help tackle the African ivory trade.

Roger Gower, 37, was tracking criminals who had killed three elephants near the Serengeti national park when a poacher opened fire with an AK-47 rifle on 29 January last year.

Continue reading...

Thorpe Wood, Peterborough This wood was here long before the city grew up around it. If it were lost its space would be instantly absorbed

Here’s a strange little peace in a tightened noose of noise. If you stumbled on it by footbridge, housing estate passage or nondescript pull-in, it would be a surprising find: an ancient worked wood caught in an outer eddy of the city. Thorpe Wood was here long before Peterborough grew up around it, before the city began to squeeze, before what little was left was mercifully protected.

The morning’s snowfall has gone. In spring there might be bluebells here, wild garlic, wood anemone, the “pock” of woodpecker, smells, shade. But in January life has descended to waist height and is thick with hardy, sharp things. At eye-level, winter’s transparency makes the wood a weave of disorderly trunks. The rafters are empty and naked, and it’s here the trees spread, contrast, throw flamboyant shapes against the sky.

Continue reading...

Australian researchers hope an antibody found in sharks may help treat an incurable lung disease.

In the face of an increasingly divided Turnbull government, Victoria’s Labor government has upped the ante on climate action, pledging to cut state emissions by up to 20 per cent within three years on the road to zero net emissions by 2050.

As 2017 kicks off, spot electricity prices are up 118% in Victoria, despite a sharp reduction in consumption. Plus, a reminder that predicting the future of the electricity market can be very hard.

New BNEF chart forecasts that 13 million barrels of oil per day will be displaced by electric vehicles by the year 2040.

UK-based autonomous transport outfit RDM Group opens Asia Pacific HQ in Adelaide, sees "massive" demand in Australia.

Climate change means Australian cities are facing more heat waves, but not all strategies to keep us cool are created equal.

RET was settled 18 months ago under former prime minister’s leadership, says Simon Birmingham

The Liberal frontbencher Simon Birmingham has dismissed Tony Abbott’s latest criticism of the Coalition’s renewable energy target, reminding Abbott that the target was settled under his leadership just 18 months ago.

Abbott warned at a Young Liberals conference at the weekend that power was getting more expensive and less reliable because the Turnbull government was making it “harder and harder” to use coal and gas through the renewable energy target.

Continue reading...

The Turnbull government's ruling out of a power sector EIS shifts more of the national abatement task over to industry. Any more policy wind-backs will increase the size of that task.

The man who ran National Grid for a decade says news stories raising blackout fears should stop.

Crocs and cattle don't mix on a Northern Territory station; meet a specialist alpaca shearer; and a fish restocking program pays big dividends in the Kimberley.

Originally published in the Guardian on 4 February 1967

MACHYNLLETH: Foxes, unlike most creatures, are noisiest in midwinter. Here they usually begin calling about a week before Christmas and go on till early February. Their normal cry is often described as a bark. But foxes are not dogs and their call sounds to me more like a honking, a strangely vibrant, rather eerie owk-owk-owk-owk. This is repeated about every half-minute for several minutes at a time, it is a far-travelling call; so when you hear it the fox may be much farther off than you suppose. But foxes will cry close to houses. One night a fox called for ten minutes just outside our garden, a loud, wild, exciting sound.

We mostly hear our foxes in the early part of the evening. But they must call on and off all night, for if I wake I occasionally hear one. On morning this week there was a fox in full voice in broad daylight but that does not happen very often. So the mating season passes. And soon, come wind, come weather, the young foxes will be born safe and warm in their burrows. But not safe for long, many of them, when the spade and terrier brigade arrives. Still, not all will be discovered, for though thousands will be killed plenty will survive to send their lovely cries through the nights of next midwinter. So let us rejoice. For the fox is, as Hudson once said, “good to meet in any green place.”

Continue reading...

Under a new French scheme cars are labelled according to the pollution that they emit. This allows the worst offenders to be banned when necessary

Last week Paris suffered its fourth smog of the winter and tried a new idea to protect its residents from the worst effects. Like many European cities, the Paris region has a well-established system of emergency actions that escalate if smog persists. Initial steps include health warnings, reduced speed limits and restrictions on lorries in the city centre. Final steps include cheaper public (€3.80 for a day pass), and bans on half of cars, using an odd/even number plate system.

Related: The UK’s deadly air pollution can be cured: here's how

Continue reading...

RETs are the only policy tool left to shift Australia’s electricity sector away from fossil fuels, RepuTex modelling shows

State-based renewable energy targets are becoming essential drivers of Australia’s carbon reduction framework and, based on current policy settings, will be vital for Australia to meet its 2030 emissions targets, according to a report by the energy consultancy RepuTex.

The finding comes amid attacks on state-based renewable energy targets by the prime minister, Malcolm Turnbull, and his ministers, who have called for them to be scrapped.

Continue reading...

Cities are facing more heatwaves, but not all strategies to keep us cool are equal. Sydney image from www.shuttrstock.com

The recent spate of heatwaves through eastern Australia has reminded us we’re in an Australian summer. On top of another record hot year globally, and as heatwaves become more frequent and intense, our cities are making us even hotter.

This is the urban heat island, where city temperatures can be significantly warmer than the surrounding rural regions.

The question, then, is what we can do to keep our cities cooler.

Why are cities hotter?

The temperature difference is caused by a range of factors, including dense building materials absorbing more of the sun’s energy, fewer trees to provide shade, and less soil to cool by evaporation.

Buildings can also act like the hairs on a husky, reducing wind speeds and blocking thermal radiation up to the night sky. On top of that, waste heat from car engines, air-conditioners and other energy use adds to overall air temperatures.

Why does this matter? Even a small increase in air temperature pushes up overall energy demand, and about 25% of our energy bills are for only 40 hours per year when the grid is most heavily used.

The most extreme heat events can buckle train lines, cause rolling blackouts and cost billions in lost productivity. And it’s not just bad for our wallets.

Heat stress can cause organ failure or exascerbate heart or breathing problems. Since 1900, extreme heat events have killed more Australians than bushfires, cyclones, earthquakes, floods and severe storms combined.

So, what can we do?

There are a number of things individuals can do to reduce the impact of heat in their homes, such as installing light coloured roofing material, insulation or an air-conditioner.

But it gets more complicated when considering the city as a whole, and how these small actions interact with each other and with the climate.

Air-conditioners

In heatwaves, air-conditioners save lives, allowing stressed bodies time to cool. But our homes can only be made cooler by blowing heat outside, along with the extra energy to run the system.

As well as increasing outside air temperatures in the short term, the fossil fuels burned add to global warming. A world cooled by air-conditioning probably isn’t the answer.

Trees and parks

Trees provide shade, but also cool the air, because evaporating water from leaves takes energy, reducing peak temperatures by 1-5° C.

Most city planners agree on the broad benefits of urban vegetation, with some metropolitan councils developing urban greening strategies.

However, urban trees can be a vexed issue for some councils; they use water, can be costly to maintain, can damage utilities and property, and can worsen air quality instead of improving it. Larger cities are often made up of dozens of councils; getting them to agree is a major challenge.

White roofs

We know that black surfaces get hotter in the sun, but demand for dark roof tiles still far outweighs demand for light colours. More reflective roofs can reduce a household’s energy bill, as well as the overall temperature of a city.

White roofs are most effective in warmer climates, because in cold climates, the cost savings in summer must be balanced with additional heating costs in winter.

Green roofs and walls

Green roofs and walls are building structures with integrated vegetation. They provide cooling benefits by shading buildings and through evaporation from leaves. They generally show less cooling benefit than white roofs, cost more to install and maintain, and use additional water and energy.

But they do look nice, improve biodiversity and make people happier.

Pavement watering

Prior to an extreme heatwave, it may be possible to reduce temperatures by wetting down building and road surfaces. It’s a traditional practice in Japan, and is now being considered in major cities like Paris.

But temperature and humidity are important factors in heat stress, so pavement watering should only be undertaken if the extra humidity does not increase heat stress.

Large scale rooftop solar

Solar panels convert energy from the sun into electricity, so less energy is required from the network overall. If enough roofs were covered with solar panels, could that lower air temperatures?

Probably a little. Other benefits include a reduction in the energy required for cooling (because the roofs are shaded by panels), and a stable, lower cost, decentralised renewable energy system.

Building density

A building with lots of thermal mass (think sturdy, double-brick home) can be an effective way to keep inside temperatures more stable. Heat is absorbed during the day and released at night. The same idea can work for an entire city.

An urban cool island can form in high-density cities like Hong Kong because tall buildings provide extra heat capacity and shade.

For similar reasons, the tight street layout of traditional Arabian and Mediterranean cities keep those streets cooler.

Shading structures

Installing light shading structures over streets, pavements and roofs can reduce the surface temperature of materials, and reduce the heat absorbed and radiated back into streets. Shading structures need to be designed so that they do not limit airflow, trapping heat and air pollution in streets.

Which is best?

To figure out what works best, we need to be able to model the physics of different strategies, in different types of cities and in different climates. We can then assess the economic and health impacts and decide on appropriate and plans that give us the biggest bang for our buck.

Here we have focused on heat in cities, but there are other important concerns like air quality or flooding.

In colder cities, an urban heat island could actually be a good thing. Each city is different; each requires a tailored and integrated plan developed over the entire metropolitan region, and then implemented locally by councils, businesses and households.

Mathew Lipson receives funding through an Australian Government Research Training Program (RTP) Scholarship, UNSW Sydney and the ARC Centre of Excellence for Climate System Science.

Melissa Hart receives funding from the ARC Centre of Excellence for Climate System Science, the NSW Environmental Trust and the NSW Office of Environment and Heritage.