Sleek ‘Defend the Planet’ Car Bumper Sticker Prompts for Clean Vector Design

Create a series of clean, high-contrast vector illustrations for car bumper stickers with the theme ‘Defend the Planet’. Use bold lines, no shading or gradients, on a pure white background. Incorporate a variety of symbols such as planets, trees, hearts, recycling icons, and slogans, all with placeholder text enclosed in []. Each design should be optimized for die-cut sticker production, emphasizing clarity and simplicity for maximum visual impact.