Create a flat colorful vector icon set about Sustainable Business (ESG), using green as the dominant color, with split-complementary colors for accents. Use rounded shapes, medium-thick lines, and simple geometry. Generate 12 icons arranged in a 3x4 grid layout, with transparent background. Each icon should communicate a specific topic within ESG such as carbon footprint, circular economy, ethical sourcing, etc. Exportable as SVG, suitable for presentation and infographics.