Our cities can be jungle gyms of cars, buildings, and concrete. But, what if they were designed to be eco-friendly? Let's dive into this idea.

Compact Cities - These are like efficient, well-packed suitcases. Less space, less travel, less infrastructure like roads or pipes needed, easier public transport and reduced urban sprawl. They're like the compact travel kit, with everything you need in a small package!

Sustainable City - A city having a minimal environmental impact. Think of it as the "Green Lantern" of cities, fighting against the "Sinestro" of pollution. Some of its superpowers include:

• Reducing fossil fuel use (more public transport)
• Keeping waste production at local-friendly levels
• Having enough green spaces (Parks, gardens, etc.)
• Reusing and reclaiming land, like those brownfield sites
• Encouraging community involvement
• Conserving non-renewable resources, and using renewable ones instead

Real-world Example: BedZED - an environmentally friendly housing development in south London. It's like a superhero's fortress with solar panels, energy-efficient homes, and accessible public transport.

C40 is a network of the world's megacities, committed to fighting climate change. It's like the Avengers, but for cities, each doing its part to combat climate change!

Their goals include improving public transport, efficient outdoor lighting, reliable infrastructure, and waste management.