P.Eng, Energy management, measurement & verification. Toronto, Canada. Born 327ppm CO2. Climate Action & electrification; Safer infrastructure; cycling; air filtration & ventilationhttps://bsky.app/profile/davidelfstrom.bsky.socialhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mts75cal6225No cheating. Share the last photo of the sky from your camera roll [contains quote post or other embedded content]24 Aug 2026 01:55 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mts75cal6225https://bsky.app/profile/davidelfstrom.bsky.social/post/3mtptmpxp2s26Ti Kwan Leep (skit) & Boot To The Head (song) People talking in movie shows People smoking in bed People voting Republican Give them a boot to the head! [contains quote post or other embedded content]23 Aug 2026 03:23 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mtptmpxp2s26https://bsky.app/profile/davidelfstrom.bsky.social/post/3mtpkoeqx522aWhat a bunch of weirdos. The tariff list contains many oddly specific items. https://www.cfib-fcei.ca/en/site/us-tariffs23 Aug 2026 00:43 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mtpkoeqx522ahttps://bsky.app/profile/davidelfstrom.bsky.social/post/3msraiqvbrc24Heads up Canadian #crbox builders and PC fan air cleaner enthusiasts – Canadian Tire has a sale on 2-packs of Filtrete 1900 starting Thursday for $26.99 ($13.50 each). Normal price is $64.99, hope they are in stock by then. No rainchecks. @northboxsystems.bsky.social (That's like $9.64 each in USD)10 Aug 2026 23:21 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3msraiqvbrc24https://bsky.app/profile/davidelfstrom.bsky.social/post/3mslk574hds2z—How about electro-magnetic launch catapults on aircraft carriers? —No, not like that! [contains quote post or other embedded content]08 Aug 2026 16:58 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mslk574hds2zhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mslffvwo7c2lBefore/after dog grooming08 Aug 2026 15:33 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mslffvwo7c2lhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3msjzj3my5k2aWe had a human vaccine for Lyme disease in the 90's that was 80% effective. It got pulled after attacks by anti-vaccine pushback. But your dog can get one. [contains quote post or other embedded content]08 Aug 2026 02:27 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3msjzj3my5k2ahttps://bsky.app/profile/davidelfstrom.bsky.social/post/3ms5lawo4ks2qThere's a Nathan W. Pyle comic for that [contains quote post or other embedded content]03 Aug 2026 03:40 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3ms5lawo4ks2qhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3ms2bglb5mc2gWhen we booked our Algonquin backcountry trip I was disappointed because a full moon would make for poor stargazing. Had NO idea the full moon would rise in the east opposite in the sky from the sunset an hour earlier. Absolutely stunning. Photos can't really capture it.01 Aug 2026 20:07 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3ms2bglb5mc2ghttps://bsky.app/profile/davidelfstrom.bsky.social/post/3ms27qco46c2xReminder to get out and touch moss01 Aug 2026 19:36 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3ms27qco46c2xhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mr4sagiodk2yThere's still six Tuesdays before August 30. That's six T.A.C.O. Tuesday opportunities.21 Jul 2026 02:47 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mr4sagiodk2yhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mqz2ry5e7223Unusual failure mode to have a vehicle split in half. Is that intentional, or a consequence of other design choices? https://www.yahoo.com/news/us/articles/cybertruck-split-half-moving-truck-113535255.html19 Jul 2026 15:10 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mqz2ry5e7223https://bsky.app/profile/davidelfstrom.bsky.social/post/3mqrqbal74k2dA Redditor put together some instructions on on how to make an optimized 1-filter air cleaner using a box fan from my experimentation several years ago. It's in a Google drive folder here: https://drive.google.com/drive/folders/14kSJg5O6i-AByKOKgirb2vmTsnZSoZv-16 Jul 2026 17:13 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mqrqbal74k2dhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mqrbjxq5xk2qWorking outdoors? Child at outdoor day camp? Anyone outside for 6 hours today in Southern Ontario will be effectively smoking three cigarettes during that time. More if you're active. Twelve cigarettes over a full day. https://map.purpleair.com/air-quality-cigarettes-per-day?opt=%2F1%2Flp%2Fa10%2Fp604800%2FcC0#9.23/43.6074/-79.478316 Jul 2026 12:49 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mqrbjxq5xk2qhttps://bsky.app/profile/davidelfstrom.bsky.social/post/3mqplosm2dk22Brantford is now at 500 μg/m3!! GET INSIDE!15 Jul 2026 20:46 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mqplosm2dk22https://bsky.app/profile/davidelfstrom.bsky.social/post/3mqpgogokh226Sarnia is unaffected by wildfires as the Minister makes his speech about sovereign energy pipelines there. Meanwhile, Kitchener's air is downright hazardous. [contains quote post or other embedded content]15 Jul 2026 19:16 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mqpgogokh226https://bsky.app/profile/davidelfstrom.bsky.social/post/3mqpfjodq5225LOL https://www.ft.com/content/3a023b95-66c3-41e1-b0ce-df752a49954115 Jul 2026 18:55 +0000at://did:plc:3a43qvblimqkecprththymuj/app.bsky.feed.post/3mqpfjodq5225