Urban areas are expanding rapidly, and sustainable development is key to ensuring that cities remain livable. By focusing on green infrastructure, energy-efficient buildings, and public transportation, urban planners are creating cities that can support growing populations while minimizing environmental impact. Collaboration between government, business, and citizens is crucial to achieving sustainable urban development.

Renewable energy is energy derived from natural sources that are replenished at a higher rate than they are consumed. Sunlight and wind, for example, are such sources that are constantly being replenished. Renewable energy sources are plentiful and all around us.

Fossil fuels - coal, oil and gas - on the other hand, are non-renewable resources that take hundreds of millions of years to form. Fossil fuels, when burned to produce energy, cause harmful greenhouse gas emissions, such as carbon dioxide.