Study Questions Climate Gains From Scrapping Working Combustion Engine Cars

·1 views

A new study published in the journal Science examines whether retiring a still-operational internal combustion engine vehicle actually delivers meaningful climate benefits. The research challenges the assumption that replacing older petrol or diesel cars with electric vehicles always reduces net emissions. The analysis factors in the carbon cost of manufacturing new electric vehicles alongside the emissions saved by ending combustion engine use. The findings suggest that the timing and context of a vehicle's retirement play a significant role in determining the true environmental outcome.

Read the full story at Hacker News

This is an AI-generated summary. ShortSingh links to the original source for the complete article.

Discussion (0)

How One Developer Built USDT Payment Architecture for AI Agents at Scale

A developer building roborent.cc, a marketplace where AI agents and humans earn USDT for completing tasks, has detailed the payment architecture they designed after finding traditional payment rails unworkable for automated workers. Stripe, PayPal, and bank transfers were ruled out due to KYC requirements, slow settlement times, and fees that make micro-payments unviable for bots. The system defaults to Tron's TRC-20 standard for payouts, citing roughly $0.80 flat transaction fees, three-second finality, and broad exchange support, while also accommodating BNB Chain, Arbitrum, and TON through a unified abstraction layer. A key cost-saving measure involves batching payouts every 60 seconds using a smart contract with a Merkle tree structure, reducing fees for 1,000 individual transfers from an estimated $800 down to around $0.80. The architecture also employs idempotency keys in a ledger service to prevent double-payouts, and an air-gapped signing service to protect the private keys controlling payout wallets.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

Next.js Caching Explained: Tag-Based Revalidation and Granular Cache Control

Next.js 13+ introduced a major shift in caching architecture, moving from opt-in static generation to an opt-out model where Server Components are cached by default and developers must explicitly manage invalidation. The App Router's multi-layered caching system spans the Edge Runtime, Server Components, and Node.js environments, placing greater responsibility on engineers to maintain data consistency. A key advancement is the revalidateTag API, which allows developers to invalidate cached data across multiple pages and components using named tags rather than relying solely on URLs or time-based intervals. This is especially useful when interdependent data changes — for instance, a profile update can simultaneously invalidate a header, a notification badge, and a profile page with a single tag. Traditional ISR's time-based revalidation is increasingly seen as insufficient for production apps, as it can serve stale data and trigger unnecessary rebuilds, making tag-based and granular cache strategies more practical alternatives.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

BTC Basis Bot Hits 91% Win Rate, But Its Edge Is Slowly Fading

A developer team testing automated crypto trading bots on BTC/JPY discovered that a simple buy-and-hold strategy over eight years returned 217%, outperforming every timed entry and exit bot they had built. While the bots kept drawdowns between 13–17%, the buy-and-hold approach suffered a 54% maximum drawdown, prompting the team to explore blended portfolio strategies instead. A market-neutral basis-fade bot targeting the price gap between GMO's BTC/JPY leverage and spot products achieved a 91.3% win rate and a near-zero 0.39% drawdown. However, the team found that the strategy's trade frequency had dropped sharply over time, from 55 trades in its first four years to just 14 in the most recent four, suggesting the edge was rooted in early-market volatility rather than a durable structural advantage. Classic Japanese technical indicators like Ichimoku and RCI also failed to clear the team's minimum profitability threshold, with the latter undermined by a circuit breaker that cut off recoveries during volatile periods.

0 comments Read more at DEV Community

ProgrammingDEV Community ·

OpenAI Invests $1.5 Billion in Rural Georgia Data Centre Campus

OpenAI has announced a $1.5 billion data centre campus in Effingham County, Georgia, marking one of its largest domestic infrastructure commitments to date. The facility will support AI model training and deployment at scale, while also being positioned as a regional economic development project through job creation and community partnerships. Effingham County was chosen for its available land, power infrastructure, and proximity to Savannah's logistics network, reflecting a broader industry shift toward rural sites where land and energy costs are lower. The investment is believed to be part of OpenAI's wider Stargate initiative — a joint programme with SoftBank and Oracle targeting up to $500 billion in AI infrastructure, though OpenAI has not formally confirmed the link. The move follows similar multi-billion dollar US data centre announcements by Microsoft, Google, and Amazon as AI companies race to secure compute capacity ahead of growing demand.

0 comments Read more at DEV Community