$++123.$Discuss the importance and challenges of integrating sustainable practices in large$-$scale civil engineering projects. Consider how sustainability principles can be incorporated into the planning, design, construction, and maintenance phases of civil engineering projects. Address the potential environmental, economic, and social impacts of such integration, and how these impacts can be measured and mitigated. Additionally, explore the role of policy, regulation, and stakeholder engagement in promoting sustainability within the civil engineering industry. What are the obstacles to achieving sustainability in civil engineering, and how can they be overcome through innovative approaches and technologies? Finally, discuss the long$-$term benefits of sustainable civil engineering practices for future generations and the planet.