News

23259 readers

3270 users here now

Welcome to the News community!

Rules:

1. Be civil

Attack the argument, not the person. No racism/sexism/bigotry. Good faith argumentation only. This includes accusing another user of being a bot or paid actor. Trolling is uncivil and is grounds for removal and/or a community ban. Do not respond to rule-breaking content; report it and move on.

2. All posts should contain a source (url) that is as reliable and unbiased as possible and must only contain one link.

Obvious right or left wing sources will be removed at the mods discretion. We have an actively updated blocklist, which you can see here: https://lemmy.world/post/2246130 if you feel like any website is missing, contact the mods. Supporting links can be added in comments or posted seperately but not to the post body.

3. No bots, spam or self-promotion.

Only approved bots, which follow the guidelines for bots set by the instance, are allowed.

4. Post titles should be the same as the article used as source.

Posts which titles don’t match the source won’t be removed, but the autoMod will notify you, and if your title misrepresents the original article, the post will be deleted. If the site changed their headline, the bot might still contact you, just ignore it, we won’t delete your post.

5. Only recent news is allowed.

Posts must be news from the most recent 30 days.

6. All posts must be news articles.

No opinion pieces, Listicles, editorials or celebrity gossip is allowed. All posts will be judged on a case-by-case basis.

7. No duplicate posts.

If a source you used was already posted by someone else, the autoMod will leave a message. Please remove your post if the autoMod is correct. If the post that matches your post is very old, we refer you to rule 5.

8. Misinformation is prohibited.

Misinformation / propaganda is strictly prohibited. Any comment or post containing or linking to misinformation will be removed. If you feel that your post has been removed in error, credible sources must be provided.

9. No link shorteners.

The auto mod will contact you if a link shortener is detected, please delete your post if they are right.

10. Don't copy entire article in your post body

For copyright reasons, you are not allowed to copy an entire article into your post body. This is an instance wide rule, that is strictly enforced in this community.

founded 1 year ago

MODERATORS

[email protected]

633

‘We should have better answers by now’: climate scientists baffled by unexpected pace of heating (www.theguardian.com)

submitted 2 months ago by [email protected] to c/[email protected]

302 comments fedilink hide all child comments

Temperatures above 50C used to be a rarity confined to two or three global hotspots, but the World Meteorological Organization noted that at least 10 countries have reported this level of searing heat in the past year: the US, Mexico, Morocco, Algeria, Saudi Arabia, Kuwait, Iran, Pakistan, India and China.

In Iran, the heat index – a measure that also includes humidity – has come perilously close to 60C, far above the level considered safe for humans.

Heatwaves are now commonplace elsewhere, killing the most vulnerable, worsening inequality and threatening the wellbeing of future generations. Unicef calculates a quarter of the world’s children are already exposed to frequent heatwaves, and this will rise to almost 100% by mid-century.

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 5 points 2 months ago* (last edited 2 months ago) (1 children)

110⁰ heat wave in a high humidity climate

"Have you tried switching out your shingled roof for aluminum?"

Like, idk, maybe this can save a few bucks on your AC bill. But this isn't magic. It can't keep the air getting into your house from being superheated.

[–] [email protected] -1 points 2 months ago (1 children)

But it isolates radiated heat. You'll have to pump heat built up inside. But also, aluminum radiators pointing upward can help reduce climate temperatures similar to the way trees do. Trees absorb the heat and shade the ground. These would shade and reflect heat creating a cooler area underneath if heat is not actively being generated...no humans or computers or pets. So not a silver bullet but just makes me so puzzled to see people using tar, which pollutes the ground, and steel which perfectly absorbs heat. No, the best solution is to use aluminum.

[–] [email protected] 1 points 2 months ago (1 children)

steel which perfectly absorbs heat. No, the best solution is to use aluminum.

Aluminum is far more thermally conductive and makes both a far better radiator and absorber of heat. Ultimately it's a coating that does the absorbing though, as shiny metal reflects IR regardless of the material. Source: I work with this stuff

Light coloured or reflective roofs do make sense though and that's why traditional homes in most hot climates are painted white.

[–] [email protected] 1 points 2 months ago

Yes. Ideally you want a sandwich aluminum -steel - aluminum. But that's not ideal. Sometimes you see this in heat shields around exhaust systems. But nothing beats experience. The fact is that if you put a sheet of tar roofing, a sheet of steel and a sheet of aluminum under the sun, the tar will get melty, the steel will get fucking hot and the aluminum will be nice and cool to the touch. Sure you can spray aluminum onto the steel or the tar but it won't be as efficient and you won't get the reflective properties that aluminum has. Remember the wavelength of heat is past the 0.1um and it's up to 100um, so most coatings are not that thick and most roughnesses are not that rough locally where it matters. Machined aluminum for example will have a local roughnesses less than 25um, sometimes under 1um.