Create an image showcasing three precast concrete pillars side by side, each representing a pillar of sustainability. The first pillar is inscribed with "Environmental" and adorned with greenery and natural textures to symbolize environmental sustainability. The second pillar, labeled "Economic," features engravings of coins and gears to represent economic sustainability. The third pillar, marked "Social," is embellished with a diverse array of human silhouettes to signify social sustainability. The background is simple and uncluttered to emphasize the distinct features of each precast pillar.