Proof Engine Verification: Higher atmospheric CO2 is beneficial "plant food" with no net negative effects.

Automated fact-verification of the claim: "Higher atmospheric CO2 is beneficial "plant food" with no net negative effects." Verdict: DISPROVED Key Findings SC1 (plant food effect) — SUPPORTED: 2 of 2 independent NASA sources confirm that rising CO2 has caused measurable plant greening (B1, B2). The "plant food" component of the claim has scientific support. SC2 ("no net negative effects") — DISPROVED: 3 of 3 independent government/intergovernmental sources (NOAA, NASA, IPCC) document major negative consequences of elevated CO2, falsifying the "no net negative effects" assertion (B3, B4, B5). The SC2 disproof holds on fully verified evidence alone: B4 (NASA, fully verified) documents "sea ice loss, accelerated sea level rise, and longer, more intense heat waves" now occurring — each constitutes a significant negative effect independent of B3 and B5. Overall: The compound claim is DISPROVED because SC2 is false. Even granting SC1, the claim requires both parts to hold simultaneously. Files proof.py — Re-runnable Python verification script proof.md — Structured proof report proof_audit.md — Full verification audit trail proof_narrative.md — Plain-language summary proof.json — Machine-readable structured data Generated by Proof Engine v1.0.0.