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Climate Changed: Canadian arenas adapting and improving to combat temperature changes

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It’s getting harder to make ice in Winnipeg, a city known for its frigid winters.

Warmer summers and sudden shifts in temperature in the spring and fall have made it difficult for the older refrigeration systems in Winnipeg’s municipal arenas to get the cement slab sufficiently cold. Todd McDonald, the supervisor of arena and aquatic assets for the City of Winnipeg, explained how one of the older Freon-based cooling systems he oversees is struggling to keep up with Manitoba’s changing climate.

“We used to open it up probably in the third week of September going back 25 years ago, then about 10 to 12 years ago, we had to push the opening date to Oct. 1, because we’d start the plant at the same time, but it would take so many more days and weeks to remove the heat from the slab,” said McDonald, noting that refrigeration is not the creation of cold but rather the removal of heat.

“We’ve pushed it to Oct. 15 the last several years. This year in particular, we had an Oct. 15 opening date that had to be pushed back one week due to the fact the plant is running at 100 per cent efficiency, but we just can’t remove the heat as quickly as we used to be able to.”

In the case of ice rinks, refrigeration has historically meant moving the “waste heat” outdoors through a coolant system. That’s an increasingly big challenge as Canadian arena operators have to run their ice plants longer and at higher power to counteract warmer outdoor temperatures while also trying to reduce greenhouse gas emissions and not add to the warmer environment.

Ammonia-based coolants are the most common in North American arenas. Although ammonia is highly toxic in confined spaces it has zero carbon emissions. Freon-based systems are being phased out as that chemical has a 100-year global warming potential of 1,810 or nearly 2,000 times more potent than carbon dioxide. Carbon dioxide refrigeration systems are also in use in some arenas, but they are not as widespread as either ammonia- or Freon-based systems.

Winnipeg operates 12 rinks, with 10 using ammonia-based cooling systems. The other two use Freon, which is being grandfathered out of arenas and other larger refrigeration systems across North America because of its global warming potential.

McDonald said that lowering the temperature in an ice rink — especially with the older Freon-based systems — is becoming harder each fall and during the winter when there are more warm spells than in the past.

“As the ground warms up more and more each year, it takes more and more energy to release that heat come the fall time,” he said. “As the shoulder seasons become more unpredictable that’s where we’re finding we’re struggling.

“(Winnipeg’s) cool weather in the spring was advantageous towards us but then the fall being warm wasn’t, so there’s trade offs. And engineering is all about trade offs.”

Several Canadian cities are finding new, inventive ways to create those trade offs at their arenas.

Winnipeg has a lengthy list of energy and carbon reduction measures that it’s considering. Sealing leaks, installing radiant heaters in seating areas, heat reclamation on compressors, LED lighting, and collecting rainwater for ice surface floodwater are just some of the innovations the city is examining.

The cities of Ottawa, Calgary, and Vancouver all exclusively use ammonia-based coolant at their municipally operated rinks. All seven Canadian NHL teams use ammonia-based coolants in their arenas.

A spokeswoman for the City of Toronto confirmed that the majority of its 119 ice surfaces use ammonia-based systems or will be upgraded to ammonia during ongoing state-of-repair upgrades. College Park’s Barbara Ann Scott rink, an outdoor skating trail, was completed in 2018 and uses a carbon-dioxide-based system that is non-toxic, non-flammable, and has zero net carbon emissions.

Steve Glass, manager of facility operations for the City of Calgary, said that the trope of an old, dingy refrigerator plant at a local arena is simply not a reality anymore.

“Everything’s very high-tech now and heavily designed, heavily maintained,” said Glass with a laugh. “The movies don’t depict exactly what’s happening, that’s for sure.

“We’re not banging wrenches on pipes to make things work.”

Like his counterpart in Winnipeg, Glass said his team is always finding new ways to make Calgary’s rinks more energy and cost efficient. That includes installing low emissivity fabric under ceilings that reduces solar heat seeping down from the roof and therefore the load on refrigeration systems. The city has also upgraded its ice plant condensers to be adiabatic, which means there’s no exchange of heat from the system to the building, among other improvements.

“(Our goal) is to reduce our environmental footprint, reduce our carbon footprint,” said Glass. “There’s also a sustainable operating cost reduction, which helps keep the tax base down.

“Anything that we can do with new technology that benefits Calgarians.”

Vancouver and Ottawa have both started using heat redistribution systems that take the energy produced by the ice plants and redistribute it to other parts of the arena or adjacent buildings. Craig Edwards, manager of energy and utilities with Vancouver’s real estate and facilities management department, said that the heat redistribution technology has made municipal arenas very efficient.

“You can heat entire community centre buildings easily with all the waste heat from the ice rinks,” said Edwards, who noted that all the ice rink compressors are electric and therefore low in greenhouse gas emissions. “So we’re not producing any greenhouse gas emissions to operate the ice rinks and then we also offset the emissions from all the adjacent buildings.”

Edwards said that Vancouver is in the process of using the heat waste from an arena to warm a greenhouse at the city’s Sunset Works Yard, where the parks department grows all its plants and flowers before the spring.

The City of Ottawa has also made use of the large amount of space that its arenas and community facilities occupy, installing solar panels on 12 of its large flat roofs, including four of its arenas, to produce green energy.

Toronto has also begun to install solar panels, LED efficient lighting and controls systems, as well as reflective ceiling material to reduce refrigeration operation.

This report by The Canadian Press was first published Oct. 16, 2022.

 

John Chidley-Hill, The Canadian Press

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Australia plans a social media ban for children under 16

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MELBOURNE, Australia (AP) — The Australian government announced on Thursday what it described as world-leading legislation that would institute an age limit of 16 years for children to start using social media, and hold platforms responsible for ensuring compliance.

“Social media is doing harm to our kids and I’m calling time on it,” Prime Minister Anthony Albanese said.

The legislation will be introduced in Parliament during its final two weeks in session this year, which begin on Nov. 18. The age limit would take effect 12 months after the law is passed, Albanese told reporters.

The platforms including X, TikTok, Instagram and Facebook would need to use that year to work out how to exclude Australian children younger than 16.

“I’ve spoken to thousands of parents, grandparents, aunties and uncles. They, like me, are worried sick about the safety of our kids online,” Albanese said.

The proposal comes as governments around the world are wrestling with how to supervise young people’s use of technologies like smartphones and social media.

Social media platforms would be penalized for breaching the age limit, but under-age children and their parents would not.

“The onus will be on social media platforms to demonstrate they are taking reasonable steps to prevent access. The onus won’t be on parents or young people,” Albanese said.

Antigone Davis, head of safety at Meta, which owns Facebook and Instagram, said the company would respect any age limitations the government wants to introduce.

“However, what’s missing is a deeper discussion on how we implement protections, otherwise we risk making ourselves feel better, like we have taken action, but teens and parents will not find themselves in a better place,” Davis said in a statement.

She added that stronger tools in app stores and operating systems for parents to control what apps their children can use would be a “simple and effective solution.”

X did not immediately respond to a request for comment on Thursday. TikTok declined to comment.

The Digital Industry Group Inc., an advocate for the digital industry in Australia, described the age limit as a “20th Century response to 21st Century challenges.”

“Rather than blocking access through bans, we need to take a balanced approach to create age-appropriate spaces, build digital literacy and protect young people from online harm,” DIGI managing director Sunita Bose said in a statement.

More than 140 Australian and international academics with expertise in fields related to technology and child welfare signed an open letter to Albanese last month opposing a social media age limit as “too blunt an instrument to address risks effectively.”

Jackie Hallan, a director at the youth mental health service ReachOut, opposed the ban. She said 73% of young people across Australia accessing mental health support did so through social media.

“We’re uncomfortable with the ban. We think young people are likely to circumvent a ban and our concern is that it really drives the behavior underground and then if things go wrong, young people are less likely to get support from parents and carers because they’re worried about getting in trouble,” Hallan said.

Child psychologist Philip Tam said a minimum age of 12 or 13 would have been more enforceable.

“My real fear honestly is that the problem of social media will simply be driven underground,” Tam said.

Australian National University lawyer Associate Prof. Faith Gordon feared separating children from there platforms could create pressures within families.

Albanese said there would be exclusions and exemptions in circumstances such as a need to continue access to educational services.

But parental consent would not entitle a child under 16 to access social media.

Earlier this year, the government began a trial of age-restriciton technologies. Australia’s eSafety Commissioner, the online watchdog that will police compliance, will use the results of that trial to provide platforms with guidance on what reasonable steps they can take.

Communications Minister Michelle Rowland said the year-long lead-in would ensure the age limit could be implemented in a “very practical way.”

“There does need to be enhanced penalties to ensure compliance,” Rowland said.

“Every company that operates in Australia, whether domiciled here or otherwise, is expected and must comply with Australian law or face the consequences,” she added.

The main opposition party has given in-principle support for an age limit at 16.

Opposition lawmaker Paul Fletcher said the platforms already had the technology to enforce such an age ban.

“It’s not really a technical viability question, it’s a question of their readiness to do it and will they incur the cost to do it,” Fletcher told Australian Broadcasting Corp.

“The platforms say: ’It’s all too hard, we can’t do it, Australia will become a backwater, it won’t possibly work.’ But if you have well-drafted legislation and you stick to your guns, you can get the outcomes,” Fletcher added.

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A tiny grain of nuclear fuel is pulled from ruined Japanese nuclear plant, in a step toward cleanup

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TOKYO (AP) — A robot that has spent months inside the ruins of a nuclear reactor at the tsunami-hit Fukushima Daiichi plant delivered a tiny sample of melted nuclear fuel on Thursday, in what plant officials said was a step toward beginning the cleanup of hundreds of tons of melted fuel debris.

The sample, the size of a grain of rice, was placed into a secure container, marking the end of the mission, according to Tokyo Electric Power Company Holdings, which manages the plant. It is being transported to a glove box for size and weight measurements before being sent to outside laboratories for detailed analyses over the coming months.

Plant chief Akira Ono has said it will provide key data to plan a decommissioning strategy, develop necessary technology and robots and learn how the accident had developed.

The first sample alone is not enough and additional small-scale sampling missions will be necessary in order to obtain more data, TEPCO spokesperson Kenichi Takahara told reporters Thursday. “It may take time, but we will steadily tackle decommissioning,” Takahara said.

Despite multiple probes in the years since the 2011 disaster that wrecked the. plant and forced thousands of nearby residents to leave their homes, much about the site’s highly radioactive interior remains a mystery.

The sample, the first to be retrieved from inside a reactor, was significantly less radioactive than expected. Officials had been concerned that it might be too radioactive to be safely tested even with heavy protective gear, and set an upper limit for removal out of the reactor. The sample came in well under the limit.

That’s led some to question whether the robot extracted the nuclear fuel it was looking for from an area in which previous probes have detected much higher levels of radioactive contamination, but TEPCO officials insist they believe the sample is melted fuel.

The extendable robot, nicknamed Telesco, first began its mission August with a plan for a two-week round trip, after previous missions had been delayed since 2021. But progress was suspended twice due to mishaps — the first involving an assembly error that took nearly three weeks to fix, and the second a camera failure.

On Oct. 30, it clipped a sample weighting less than 3 grams (.01 ounces) from the surface of a mound of melted fuel debris sitting on the bottom of the primary containment vessel of the Unit 2 reactor, TEPCO said.

Three days later, the robot returned to an enclosed container, as workers in full hazmat gear slowly pulled it out.

On Thursday, the gravel, whose radioactivity earlier this week recorded far below the upper limit set for its environmental and health safety, was placed into a safe container for removal out of the compartment.

The sample return marks the first time the melted fuel is retrieved out of the containment vessel.

Fukushima Daiichi lost its key cooling systems during a 2011 earthquake and tsunami, causing meltdowns in its three reactors. An estimated 880 tons of fatally radioactive melted fuel remains in them.

The government and TEPCO have set a 30-to-40-year target to finish the cleanup by 2051, which experts say is overly optimistic and should be updated. Some say it would take for a century or longer.

Chief Cabinet Secretary Yoshimasa Hayashi said there have been some delays but “there will be no impact on the entire decommissioning process.”

No specific plans for the full removal of the fuel debris or its final disposal have been decided.

The Canadian Press. All rights reserved.

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Dabrowski, Routliffe remain unbeaten at WTA Finals, reach semifinals in Riyadh

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RIYADH, Saudi Arabia – Gabriela Dabrowski of Ottawa and New Zealand’s Erin Routliffe rallied to defeat Americans Caroline Dolehide and Desirae Krawczyk 4-6, 6-3, (10-6) on Thursday at the WTA Finals.

With the win, Dabrowski and Routliffe completed the round-robin stage with a perfect 3-0 record at the season-ending tournament, which features the WTA Tour’s top eight women’s doubles teams.

The No. 2 seeds secured first place in their pool with the win, rallying from a set and break down to finish the match in 93 minutes.

Dolehide and Krawczyk, who defeated Dabrowski and Routliffe in the final at Toronto’s National Bank Open in August, closed their first WTA Finals with a 0-3 record.

Dabrowski and Routliffe will face American Nicole Melichar-Martinez and Australia’s Ellen Perez, who finished second in their group with a 2-1 record, in Friday’s semifinal.

The final is scheduled for Saturday.

This report by The Canadian Press was first published Nov. 7, 2024.

The Canadian Press. All rights reserved.



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