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A future that may not come

Lessons on green technologies that should save the world 

Published

21 April 2022

Category

Discourse

Welzow-Süd mine from south, June 5, 2019. Source: Wikimedia Commons

This is an overview of the presentation Filippo Imberti made for the Nobel Fest event last week. He participated in the open dialogue about the global practices, issues and changing trends is essential in achieving well-functioning and liveable environments.

This overview looks at the role of cities in carbon emissions, and potential solutions:
1. We only have 28 years to meet the zero-carbon targets according to the International Energy Agency (IEA)

28 years left to meet zero-carbon targets

48 years for current clean energy technologies to meet carbon targets
IEA

2. This interest the urban practice since cities take up a lot more CO₂ than other land uses:

75% of CO₂ from cities

14.8% of CO₂ from agriculture and land use change
UN Environmental Programme, Climate Watch
68% population in cities in 2050

3% global cities coverage
UN Habitat

How do cities take such a big percentage of CO₂ emissions? There are three main components
Buildings

10.9% of global CO₂ from residential buildings
Climate Watch

Land consumption vs density and mix of uses
Better public and shared spaces for co-living, Source: School of Earth and Environment
Mobility and fossil fuels

11.9% of global CO₂ from road transport and commuting
Climate Watch

While the panorama is not looking good, this overview provides quick ideas to change city making, to reduce CO2 emissions and design greener urban futures:
  • Understand cities as the main sources of CO2 and, at the same time, the main spaces humans live in
  • Identify and change building materials that are more polluting
  • Think of densification and flexible use policies to implement a better use of space
  • Change the mode of transportation and mobility

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