The Effects of Climate Change Appear in Human Blood Chemistry

Today's r/science reads like a ledger of modern trade-offs: bodies absorbing the atmosphere we built, brains gamified by rewards we engineered, and intimacy calibrated by expectations we learned. The community isn't just parsing studies; it's tallying costs—environmental, cognitive, and relational—and asking who's really paying.

Bodies under pressure: from the air we breathe to the care we deliver

The day's starkest warning comes via an analysis tying rising serum bicarbonate to atmospheric CO2, reframing climate change as a literal blood chemistry story rather than an abstract emissions curve. On the clinical front, an audit of nitrous oxide use in UK dentistry points to wasteful sedation practices with outsized climate impact—proof that even routine care can quietly punch above its weight in emissions.

"50 years from now doesn't matter. All that matters is bottom line go up this quarter. The profit motive is killing us."

- u/kmatyler (4570 points)

While the atmosphere creeps into metabolism, lab science counters with mechanistic clarity: a study explaining how ketogenic diets dampen neuronal signaling shows how targeted physiology can beat seizures without dogma. And if nutrition is where policy panic meets pantry pragmatism, a broad review of egg consumption and cardiovascular outcomes argues that modest intake may belong to the “sensible, cheap, and healthy” category—an inconvenient data point for absolutists who treat food choices as ideology more than evidence.

Motivation markets: dopamine, distraction, and domestic alignment

Reward drives motion, literally: the community spotlighted a finding that unexpected rewards trigger a dopamine surge and faster movement, quantifying the “skip in your step” as an algorithm of surprise. In the shadow of that neurochemistry, the attention economy does what it does best, as a new daily-cycle study of smartphone relief and next-day disconnection maps how micro-escapes quietly compound malaise.

"You don't have a strong enough reward system to motivate you to do things… stimulants help because the increased dopamine balances out the deficit."

- u/ftgyhujikolp (238 points)

Zoom out, and motivation looks marital as much as neural: a study linking men's workplace fulfillment to alignment with a partner's money beliefs suggests values consensus can stabilize the daily grind more than perks or slogans. If dopamine shapes momentum and phones siphon focus, then shared financial meaning might be the rare social buffer that restores direction.

Intimacy metrics: satisfaction, novelty, and altered states

Against decades of assumptions, a meta-analysis finds partnered women reporting slightly higher sexual satisfaction than men, even after accounting for relationship quality. Meanwhile, a demographic lever moves quietly: individuals high in openness gravitate toward exploration over reproduction, with a study linking intellectual novelty-seeking to fewer lifetime children—a reminder that curiosity competes with caretaking in real budgets of time and energy.

"Could it be explained by mismatched libidos?"

- u/psymunn (861 points)

Altered states enter the chat with a qualitative look at sex and cannabis, where a study of young adults charts motivations from anxiety relief to sensation enhancement. In other words, satisfaction is not a singular metric but a system—shaped by expectations, novelty, and routines that people build to feel present, connected, and, yes, more alive.

Journalistic duty means questioning all popular consensus. - Alex Prescott