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

Verdict: DISPROVED - 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