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feat: display CO2 in kg when ≥ 1 000 g for readability #618

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Merged
rajbos merged 1 commit into from
Apr 18, 2026
+23 −7
Merged

feat: display CO2 in kg when ≥ 1 000 g for readability #618

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14 changes: 11 additions & 3 deletions cli/src/commands/environmental.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
*/
import { Command } from 'commander';
import chalk from 'chalk';
import { discoverSessionFiles, calculateDetailedStats, fmt, formatTokens, ENVIRONMENTAL } from '../helpers';
import { discoverSessionFiles, calculateDetailedStats, formatTokens, ENVIRONMENTAL } from '../helpers';
import type { PeriodStats } from '../../../vscode-extension/src/types';

export const environmentalCommand = new Command('environmental')
Expand Down Expand Up @@ -38,7 +38,7 @@ export const environmentalCommand = new Command('environmental')
console.log(chalk.dim('Methodology: Estimates based on industry averages for AI inference'));
console.log(chalk.dim(` CO₂: ${ENVIRONMENTAL.CO2_PER_1K_TOKENS} gCO₂e per 1K tokens`));
console.log(chalk.dim(` Water: ${ENVIRONMENTAL.WATER_USAGE_PER_1K_TOKENS} L per 1K tokens`));
console.log(chalk.dim(` Tree absorption: ${fmt(ENVIRONMENTAL.CO2_ABSORPTION_PER_TREE_PER_YEAR)} g CO₂/year\n`));
console.log(chalk.dim(` Tree absorption: ${formatCo2(ENVIRONMENTAL.CO2_ABSORPTION_PER_TREE_PER_YEAR)} CO₂/year\n`));

for (const period of periods) {
printEnvironmentalStats(period.label, period.emoji, period.stats);
Expand Down Expand Up @@ -75,6 +75,14 @@ export const environmentalCommand = new Command('environmental')
console.log(chalk.dim(`Last updated: ${stats.lastUpdated.toLocaleString()}\n`));
});

/** Format CO₂ in grams, switching to kg notation when ≥ 1 000 g */
function formatCo2(grams: number): string {
if (grams >= 1000) {
return `${(grams / 1000).toFixed(2)} kgCO₂e`;
}
return `${grams.toFixed(3)} gCO₂e`;
}

function printEnvironmentalStats(label: string, emoji: string, stats: PeriodStats): void {
console.log(chalk.bold(`${emoji} ${label}`));
console.log(chalk.dim('─'.repeat(55)));
Expand All @@ -86,7 +94,7 @@ function printEnvironmentalStats(label: string, emoji: string, stats: PeriodStat
}

console.log(` Tokens used: ${chalk.bold.yellow(formatTokens(stats.tokens))}`);
console.log(` CO₂ emissions: ${chalk.bold(stats.co2.toFixed(3))} gCO₂e`);
console.log(` CO₂ emissions: ${chalk.bold(formatCo2(stats.co2))}`);
console.log(` Water usage: ${chalk.bold(stats.waterUsage.toFixed(3))} liters`);

if (stats.treesEquivalent > 0) {
Expand Down
16 changes: 12 additions & 4 deletions vscode-extension/src/webview/environmental/main.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,14 @@ function smartFixed(value: number): string {
return formatFixed(Math.round(value), 0);
}

/** Format CO₂ in grams, switching to kg notation when ≥ 1 000 g */
function formatCo2Grams(grams: number): string {
if (grams >= 1000) {
return `${smartFixed(grams / 1000)} kg`;
}
return `${smartFixed(grams)} g`;
}

type AnalogyItem = { icon: string; text: string };

const co2AnalogyItems = (grams: number): AnalogyItem[] => [
Expand Down Expand Up @@ -188,10 +196,10 @@ function buildImpactCards(
],
// CO₂ card
[
['📅 Today', `${smartFixed(stats.today.co2)} g`, co2AnalogyItems(stats.today.co2)],
['📈 Last 30 Days', `${smartFixed(stats.last30Days.co2)} g`, co2AnalogyItems(stats.last30Days.co2)],
['📆 Previous Month', `${smartFixed(stats.lastMonth.co2)} g`, co2AnalogyItems(stats.lastMonth.co2)],
['🌍 Projected Year', `${smartFixed(projectedCo2)} g`, co2AnalogyItems(projectedCo2)],
['📅 Today', formatCo2Grams(stats.today.co2), co2AnalogyItems(stats.today.co2)],
['📈 Last 30 Days', formatCo2Grams(stats.last30Days.co2), co2AnalogyItems(stats.last30Days.co2)],
['📆 Previous Month', formatCo2Grams(stats.lastMonth.co2), co2AnalogyItems(stats.lastMonth.co2)],
['🌍 Projected Year', formatCo2Grams(projectedCo2), co2AnalogyItems(projectedCo2)],
],
// Water card
[
Expand Down
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