Recent Middle East conflict-driven energy price surges, with Brent crude near $100 per barrel, represent the dominant factor compressing 2026 global GDP growth expectations toward the 2.5–3.1% range reflected in Polymarket odds. IMF, World Bank, OECD, and UN forecasts from June–September 2026 cluster between 2.5% and 2.9%, citing higher inflation, tighter monetary policy, and subdued consumer spending that offset resilient AI-related investment and select emerging-market demand. Institutional projections incorporate these crosscurrents while noting downside risks from prolonged supply disruptions and upside potential from faster energy-price normalization. Key near-term catalysts include October–December 2026 inflation and trade data releases plus any de-escalation signals that could shift the market-implied distribution between sub-3% and 3.0–3.2% outcomes.