The US ambassador to Canada said Trump’s suggestion that the US may not renew CUSMA should be viewed as an invitation to negotiate. In related news: Senator Tuberville says Canada is undercutting Alabama’s lumber industry; and a hike in US interest rates is possible amid inflation and geopolitical uncertainty. Meanwhile: the cause of death is released at Washington paper mill tank implosion.
In Wood Product news: New Zealand studies prefabricated mass timber modules; and wood is showcased in two award programs: US WoodWorks, and the American Institute of Architects.
In Forestry/Wildfire news: more debate over old-growth management in BC parks; the Cowichan River braces for another dry summer; US forest and wildfire research programs face funding cuts and relocations; and a new study says low-severity fire can reduce wildfire smoke impacts.
Finally, scientists map the world’s largest living network—an underground web of fungi.
Kelly McCloskey, Tree Frog News Editor
Three years ago, the Ontario Building Code required that any developer taking on a mid-rise wood-frame building had to construct stairwells out of non-combustible material. That was expensive. It made construction challenging, and, according to the Canadian Wood Council, resulted in a lower adoption of wood-frame building. Since that requirement was removed in 2023, allowing full buildings to be constructed with wood, interest in mid-rise wood-frame building has increased considerably, especially for residential builds, said Hailey Quiquero, with the WoodWorks Ontario program, an initiative of the Canadian Wood Council. “Now, in our market, we’re sitting at around 50% of five- and six-storey buildings being built out of wood construction, so a great jump,” Quiquero said. “We’ve still got a long way to go. In BC, I think it’s greater than 80% of this market.” …Currently in Ontario, mid-rise wood-frame building is largely being used in residential projects, Quiquero said.
LAKE COWICHAN, BC — Pumps will likely be required to sustain the river if dry conditions continue through the summer, according to Brian Houle, environment manager for Domtar Crofton Mill. Though the mill has shut down, Domtar remains the licenced operator. As of a June 4 report issued by Houle, Cowichan Lake has dropped to 80% capacity and the below-average snowpack has already fully melted. Updated modelling for the remainder of the year was analysed at a meeting of regulators and Cowichan Tribes on June 3. Domtar was guided to begin to reduce the flow to below 7.08 cubic meters per second (cms). …With no relief in sight, there’s been a push for a larger replacement weir to store more water in the lake to reduce the need for emergency pumping. …Domtar has been authorized to have qualified professional biologists monitor the river conditions. 
SEATTLE — Few public universities get more federal research funding than the University of Washington. So as President Trump has already cancelled or suspended about a quarter of all funding for the National Science Foundation and National Institutes for Health, the atmosphere on this leafy Seattle campus is tense. The anxiety is even trickling down to lower profile places once considered safe from White House politics, like UW’s School of Environmental and Forest Sciences. Here, newly proposed U.S. Forest Service funding cuts and a larger reorganization of the agency would have immediate consequences as the West looks poised for an epic summer of wildfires and smoke. “We have a wildfire crisis in the West [and] in the United States,” says Ernesto Alvarado, a fire ecologist and associate professor at the school. …But the Seattle smoke lab is now on a list of 56 out of 90 research stations identified for closure.
The Agriculture Department is making an ultimatum to thousands of its employees as part of its sweeping relocation plans — move to keep their jobs or quit. USDA is embarking on a multi-part reorganization plan that involves relocating more than half of its D.C.-area workforce to hubs across the country by the end of this summer. Employees impacted by these relocation plans work at the Food Safety and Inspection Service, Forest Service, Economic Research Service, National Institute of Food and Agriculture, and Food and Nutrition Service. …The memo also states that NASS and all components under USDA’s research, education and economic mission area will offer buyouts and early retirement to employees who received relocation notices. The Forest Service told employees earlier this month that it will offer Voluntary Early Retirement Authority (VERA) and Voluntary Separation Incentive Payments (VSIP) to staff impacted by its relocation plans.
Wildfires are reversing decades of air quality improvements across much of the US. Expanded use of prescribed fire is a primary proposed solution, but air quality trade-offs—more initial smoke for less smoke later—remain poorly quantified. Using two decades of satellite-derived measurements of fire severity and smoke particulate matter across California, we assessed the causal effect of low-severity wildfire, a proxy for prescribed burning, on subsequent wildfire activity and air quality. We found that low-severity fire reduced the probability of very-high-severity wildfire by 92%, with reductions lasting a decade and extending 5 kilometers from treated locations. Reduced future smoke far outweighed the smoke produced during treatment, with benefit-cost ratios exceeding five after a decade. Sustained treatment of 500,000 acres annually would reduce cumulative smoke fine particulate matter (PM2.5) by about 10% after a decade.
Deming, Washington — Leroy Sande was pioneering a road with his excavator in Southeast Alaska when stumps, rocks, everything else — including his rig — started to pitch down the hillside. As if reaching out with his own arm, the logger instinctively grabbed at the slick sandstone beneath 10 feet of soil with the excavator’s bucket. “Well, you ain’t grabbing sandstone,” Sande, now 83, recalled. “…There was nothing to grab onto that wasn’t going down the hill.” About 400 yards down slope, the excavator tipped over and came to a stop. It was the only time in his 50-plus-year career in the woods that Sande put an excavator on its side, and even then, he emerged from the machine unscathed. Logging is the most deadly occupation in the nation… Injuries that aren’t fatal can put someone out of work for weeks, months, years or the rest of their life. The annual 
