Earlier today we counted down This Big City’s most popular posts of 2011 from 30-21, and here’s ten more to add to the list:

20. 2025 – the Future of Mobility and our Cities

Politicians may be delaying the transition to a more sustainable lifestyle, but scientists and technologists are on top of the challenge, says Jonathon Porritt in this post, presenting 6 key points for creating sustainable cities.

19. Is the World’s Greatest Green Roof in Warsaw, Poland?

Ninth biggest city in Europe, best green roof in Europe. This photo essay from the roof of Warsaw University’s library shows the potential green roofs have to transform cities all over the world. Read my post here.

18. Transport Innovations – How to Make a City Flow

A lack of coordination in cities is creating transport infrastructure like ‘a relay race without proper teams’, say Matt Kaplan and Anna Simpson in this post. So what can be done to resolve this? Read the article here.

17. A Critique of the Economist’s Most Liveable Cities Report

Is Vancouver the best city and Zimbabwe’s Harare the worst city? In this post, Tao Rugkhapan suggests that Economist’ ‘liveable cities’ report might not be the best way of finding out which cities are truly liveable. Read the article here.

16. What Makes a Liveable City?

This infographic shows how we can create ‘liveable, loveable cities’, listing resilience, authenticity, and inclusiveness as the critical ingredients. See the infographic here.

15. Local Economic Implications of Urban Bicycle Networks

Could bicycle networks benefit cities, providing a relatively inexpensive way to boost local urban economies? In this piece, I look at how bike networks are good for local retailers, and can create more jobs than road construction. Read the article here. 

14. Are Streets More Walkable with Pavements Removed?

It might sound counterintuitive, but might it actually be safer to mix pedestrians, cyclists, and automobiles? In this post, Adam Davies looks at one street in London attempting to do just that. Read the article here.

13. What London’s Cycle Hire Scheme got Right (and What it got Wrong)

Look at the numbers alone and London’s cycle hire scheme seems to be a huge success. But it’s not all good news. In this post, I look at the best and worst of the Boris bikes. Read the article here.

12. Five Cities with Congestion Pricing

Cities across the globe are introducing congestion pricing systems, but there are many different approaches to the simple concept of paying to enter a city. Theodore Brown presents five examples.

11. A City with too Many Bicycles – Amsterdam’s Unique Problem

Crazy concept I know, but what happens when a city has too many bicycles? In this post I look at how Amsterdam is staying on top of the challenge of abandoned bicycles in the city centre. Read the article here.