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Telstra signs deal for 70MW solar farm in Queensland to help manage energy costs. It is yet another sign that the corporate PPA market for wind and solar is finally taking off in Australia, and is the first move of the new Telstra Energy division.

António Guterres says exiting landmark accord would threaten US economy and society: ‘If someone leaves a void, I guarantee someone will fill it’

The UN secretary general, António Guterres, warned on Tuesday that if the US exits the Paris climate agreement, there could be negative economic, security and societal consequences for the country.

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The Federal Government's paving the way for the Clean Energy Finance Corporation (CEFC) to invest in so-called clean coal projects alongside renewables.

The Breakthrough Institute says a new generation of small modular nuclear reactors 'do not exist yet' but commercial interests are looking for places to do the first building.

Karla Way-McPhail, who runs mining labour and equipment companies, will not say whether she will recuse herself from Carmichael decision

A director of the independent board due to provide recommendations regarding a $900m taxpayer loan to Adani publicly declared she was “very supportive” of its “vital” coal project, a day after she was accused of allowing a perceived conflict of interest to develop.

Karla Way-McPhail, who runs mining labour and equipment hire companies, last week told a central Queensland newspaper that Adani’s Carmichael mine project would be “a huge boost” for the region.

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US President Donald Trump has announced that he will decide this week whether to follow through on his threat to pull out of the Paris climate agreement. Some news outlets are already reporting that he has decided to leave. But would the world be better off if the US stays or goes?

An array of environmental groups, businesses and leaders of other countries are calling for the US to stay. While their reasons vary, a common theme is that the US has both a moral obligation to play its part in global climate policy, and an economic interest in doing so.

Many of these arguments rely on the US taking strong domestic climate action. But Trump has already begun dismantling a raft of Obama-era climate policies. Unless reversed, these moves will ruin any chance of the US meeting its current target of reducing emissions by 26-28% below 2005 levels by 2025. Trump’s draft budget would also drastically cut US climate aid to developing nations.

With this in mind, the question becomes: is global climate policy better served if a recalcitrant major power stays on board or if it goes its own way?

Considered this way, the arguments for leaving become harder to dismiss. In two thought-provoking commentaries, climate policy experts Luke Kemp of the Australian National University and Matthew Hoffmann of the University of Toronto argue that the world would actually better off if the US pulls out. Two reasons loom large in these analyses: the US would be prevented from white-anting further UN negotiations, and the backlash to its withdrawal would spur on China, Europe and other nations to greater action.

But if we look closely at each argument, it’s far from clear that leaving is the lesser evil.

Sidelining US obstruction?

It is not a foregone conclusion that the US, if it stayed, would be able to hold the talks hostage or successfully water down rules aimed at preventing countries from backsliding on their targets. Granted, the UN’s consensus-based model makes this a real danger, but climate negotiations have reached decisions even in the face of opposition from a major power, as happened when Russia was overridden in 2012.

What’s more, withdrawing wouldn’t necessarily stop the US trying to play spoiler anyway. Formal withdrawal from Paris could take until late 2020. Even then (assuming a more progressive president isn’t elected shortly after that), the US could still cause trouble by remaining within the Agreement’s parent treaty, the United Nations Framework Convention on Climate Change (UNFCCC).

The “nuclear option” of withdrawing from the UNFCCC itself would create further problems. Rejoining it would be likely to require the approval of the US Senate (which, given its current makeup, seems highly doubtful), whereas a new administration could rejoin Paris through a Presidential-executive agreement.

Will other countries do more?

Major economies like China and India have their own domestic reasons for cutting emissions, not least local air pollution and energy security. Both China and India plan to stick with the agreement regardless of what the US does. There are signs that they will exceed their current climate targets, thus more than outweighing the increase in emissions resulting from US climate policy rollbacks. We can’t be confident that US withdrawal would encourage China and India to do any more than they are already doing now.

The Kyoto Protocol provides a sobering precedent: while those countries that stayed in the protocol complied with their targets, none of them raised their targets to take up the slack when the US withdrew.

Writing in The Conversation, Luke Kemp suggests that US withdrawal could trigger countries to slap carbon tariffs on US imports. Large economies such as the European Union and China could attempt to do so outside the Paris framework, but few (if any) major trading partners will be eager for a trade war with the US.

US withdrawal is just as likely to demotivate other countries as energise them. Nations with less domestic momentum on climate policy may likewise pull out, water down their current or future targets, or fail to ratify Paris. For now, Australia plans to stay in, regardless of what the US does. A greater risk is Russia, the world’s fifth-largest emitter, which doesn’t plan to ratify the Paris Agreement until at least 2019. Other reluctant countries whose stance may be influenced by what the US does include Saudi Arabia and the Philippines (which have ratified Paris) and Iran and Turkey (which have not).

Fallout for multilateralism

Neither of the two arguments I’ve discussed so far amounts to a solid case for leaving. Meanwhile, there is another key reason for the US to stay: the risk that its withdrawal would strike a broader blow to the principle of multilateralism – the idea that tough global problems need to be solved through inclusive cooperation, not unilateral action or a spaghetti bowl of bilateral deals.

The UN climate talks are firmly integrated into the bigger picture of global diplomacy, and the Paris deal itself was seen as a huge achievement for multilateralism. Both the US and Australia previously suffered significant diplomatic fallout for deciding to stay out of Kyoto.

The international reaction to withdrawal from Paris would be even harsher. US participation was a prerequisite for China and India to sign up, and key elements of the treaty were designed to enable the US to join. To pull out after all that would be an egregious violation of trust and goodwill.

Some might welcome the resulting diminution of Trump’s ability to push through his agenda globally. But ultimately the erosion of multilateralism – already damaged by Brexit and Trump’s abrasive trip to Europe – is in no country’s interest if it undermines international trust and cooperation on issues like trade, public health and security.

Treaty withdrawal is uncommon in international diplomacy, arguably much more so than non-compliance. One of the few studies on this issue found that only 3.5% of multilateral treaties had any withdrawals. As most treaty exits are concentrated in a small number of treaties, the risk of knock-on effects is a real concern. When Canada withdrew from Kyoto, for example, it cited US non-participation as a justification.

Given how badly the US is behaving on climate policy, it is tempting to argue that it needs some time out from Paris until it’s ready to play nicely with the other kids again. But the fallout from US withdrawal could last far longer than a one- or two-term Republican presidency.

Withdrawal from Paris would signal, more emphatically than domestic inaction alone, that a major polluter is ready to turn its back on the international consensus that a 2℃ warmer world should be avoided. That would be bad, not just for international cooperation on climate change, but also for the broader project of multilateralism.

Thanks to Christian Downie, John Dryzek, Mark Howden, Luke Kemp (whom the author debated at an event held by the ANU Climate Change Institute), Peter Lawrence and Jeff McGee for insightful and lively discussions on this topic.

Jonathan Pickering's postdoctoral fellowship is funded by the Australian Research Council.

Exclusive: ice cores and records from the Black Death show lead entered the air from human activity – and scientists claim “natural background” levels are zero

Analysis of an ice cores taken from the Swiss Alps together with records dating from the time of the Black Death have revealed that there is no “natural” level of lead in the air, researchers have claimed.

Once in the body, lead is known to have harmful impacts on health, from behavioural to neurological, reproductive and cardiovascular effects.

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Actor’s efforts to persuade Temple Guiting to generate its own electricity captured in BBC4’s Great Village Green Crusade

Robert Llewellyn is not a typical eco-activist. “Oh, I’m absolutely un-green,” says the actor and TV presenter. “I’m as un-green as a corporate exec. I fly a lot. Though I have hugged a tree. Actually, I’ve lent against one while I was having a wee in the woods, I’m not sure if that counts?”

You don’t need to wear an environmental hairshirt, however, to believe it’s possible to live in a different, more sustainable way. For the actor, who presented Scrapheap Challenge on Channel 4 and is best known for playing Kryten on BBC2’s Red Dwarf, that belief stemmed from a longstanding passion for new technologies, particularly renewable energy.

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The modified drug might help tackle resistant superbug infections, experts hope.

Pictures from across Australia and New Zealand show the Southern Lights in the night sky.

Australia's Great Barrier Reef lost nearly a third of its corals in the past year, officials have said.

New Noaa research shows that strict conservation measures in Hawaii have not spared corals from a warming ocean in one of its most prized bays

Some of America’s most protected corals have been blighted by bleaching, with scientists warning that US reefs are on course to largely disappear within just a few decades because of global warming.

Related: Coral bleaching on Great Barrier Reef worse than expected, surveys show

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A 21st-century American infrastructure agenda depends on the Paris Agreement

There is only one part of President Trump’s agenda with real opportunity for a big win, right now, and that is infrastructure. And the Paris Agreement—the strongest ever signal pointing toward transformational infrastructure investment—is the only way to mobilize the capital necessary to get to that big win.

The common misunderstanding about the Paris accord is its impact on business and investment. Opponents fret about costs and economic change, but achieving the Paris Agreement’s goals will unlock capital investment at a rate no other policy initiative can match.

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Glencore says future of Mt Isa, and 2,000 jobs, is at risk due to rising energy prices. But it only has itself to blame, because it stupidly chose gas over renewables when given the option in 2011.

The Clean Energy Finance Corporation could be allowed to fund new coal projects, under new plans from the federal government.

Earth-i promises daily, fast-turn-around pictures and colour video of the planet's surface.

A world first hybrid renewables trial, pairing a grid-connected wind farm with lithium-ion battery storage and energy management software, has been switched on by Acciona.

In northern South Africa, former soldiers are fighting both the illegal wildlife trade and the twin scourges of unemployment and PTSD

The sun has set over the scrubby savannah. The moon is full. It is time for Ryan Tate and his men to go to work. In camouflage fatigues, they check their weapons and head to the vehicles.

Somewhere beyond the ring of light cast by the campfire, out in the vast dark expanse of thornbushes, baobab trees, rocks and grass, are the rhinos. Somewhere, too, may be the poachers who will kill them to get their precious horns.

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South Australia government has been told its energy security target legislation risks being a $3.5 billion subsidy to the gas industry that will do little if anything to address energy security, and will just reinforce the dominance of gas generators.

Onlookers are treated to a spectacular display as the Southern Lights hit Australia and New Zealand.