Shares of sugar companies witnessed a surge in buying today after Prime Minister Narendra Modi launched the Global Biofuel Alliance (GBA) on the sidelines of the G20 Summit on Saturday, which has India, the United States, and Brazil as its founding members. The alliance intends to work together to take an initiative at a global level to take ethanol blending in petrol up to 20%. Sugarcane-based ethanol is one of the most significant sources of biofuels.