Environmental Systems Engineers design holistic solutions that integrate multiple environmental components such as water treatment, waste management, energy use, and pollution control. Their work involves systems modeling, optimization, and lifecycle analysis to balance environmental performance, cost, and resilience. They use simulation tools, data analytics, and systems engineering methods to design sustainable infrastructure for cities, industries, and large facilities. Environmental Systems Engineers work in consulting firms, infrastructure projects, sustainability-focused organizations, and research institutions. Globally, demand is increasing as governments and industries adopt systems-based approaches to address climate change, resource scarcity, and sustainable development challenges.