Energy & Green Tech

'AirBubble' offers respite from Warsaw pollution

At a new playground in central Warsaw, algae feast on pollutants and carbon dioxide to provide a bubble of clean oxygen in a city ranked as one of the most polluted capitals in the EU.

Security

'Holy moly!': Inside Texas' fight against a ransomware hack

It was the start of a steamy Friday two Augusts ago when Jason Whisler settled in for a working breakfast at the Coffee Ranch restaurant in the Texas Panhandle city of Borger. The most pressing agenda item for city officials ...

Energy & Green Tech

Smog tower to help Delhi breathe but experts sceptical

A new attempt at purifying New Delhi's notoriously polluted air will see forty giant fans push out filtered air in the heart of the Indian capital's posh downtown shopping district.

Energy & Green Tech

Iran's Bushehr nuclear plant back online after two weeks

Iran's only nuclear power plant has been brought back online, its manager said early Monday, after two weeks off-grid amid a power shortage and rolling blackouts across the Islamic republic.

Engineering

Creating a sustainable city: Time, common sense and persistence

Cities want to become more sustainable but bringing that ambition to life can be quite the challenge. Academics have to work together with urban planners to help realize sustainability transformations. But when transformation ...

Automotive

As urban life resumes, can US cities avert gridlock?

Traffic is so ubiquitous in U.S. cities that until recently, imagining urban life without it meant looking to other nations for examples. Then, in 2020, COVID-19 closures and lockdowns took drivers off the roads. The thought ...

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City

A city is a relatively large and permanent settlement, particularly a large urban settlement. Although there are no agreed on technical definitions distinguishing a city from a town within general English language meanings, many cities have a particular administrative, legal, or historical status based on local law — for example an article of incorporation approved by the local cognizant (state) legislature separates towns from city government forms, rights, duties and privileges in Massachusetts — similar distinctions are made across the world, particularly in former colonies of the United Kingdom. Historically, in Europe, a city was understood to be an urban settlement with a cathedral; in later usages, especially in the United Kingdom and parts of Commonwealth of Nations, a city was a settlement with a royal charter.

Cities generally have advanced systems for sanitation, utilities, land usage, housing, and transportation and more. This proximity greatly facilitates interaction between people and businesses, benefiting both parties in the process.

A big city, or metropolis, may have suburbs and regions. Such cities are usually associated with metropolitan areas and urban sprawl, creating large numbers of business commuters. Once a city sprawls far enough to reach another city, this region can be deemed a conurbation or megalopolis.

This text uses material from Wikipedia, licensed under CC BY-SA