Eco recycling and sustainable energy line icons on white

A clean set of four black outline icons arranged in a simple grid on a white background. The symbols suggest eco-friendly themes: a laboratory flask with a sprout, a corn cob with a fuel nozzle, a recycling bin with a leaf, and a factory with a plant on the chimney. Strong contrast and generous white space give the graphic a crisp, modern feel suited to environmental design, sustainability presentations, and web interfaces. The minimal line style keeps the composition versatile for editorial use or UI icon sets. Each element is isolated and easy to read, with no added color or text. The overall look feels straightforward and informative, emphasizing renewable energy, recycling, and green industry concepts.