1. Geothermal energy, renewable energy, electric battery technology, sustainable transport, informal employment, global energy demand
2. Population growth, food supply, GM crops, organic farming, forest ecosystem, goods and services, rural sustainability strategies
3. Quaternary sector, employment location, technology infrastructure, academic clusters, knowledge economy
4. Suburbanisation, urban expansion, rural-urban fringe, megacities, brownfield development, environmental challenges
5. Squatter settlements, informal housing, infrastructure improvement, government and NGO strategies, urban inequality
6. Urban air pollution, waste management, urban flooding, transport emissions, climate adaptation, green spaces, urban environmental policy