World Population Projected to Reach 9.8 Billion in 2050.
“These Are Significantly Impacts and Influence Us and Our Services That Radically Needs the World”.
Globally, in the 1950s, one-third (1/3) of the world population lived in urban areas. Today, over one-half (1/2) of the population resides in cities, and by 2050, it is projected that 6.3 billion people, or two-thirds (2/3 of 9.8 billion), will live and work in urban environments. This trend of urbanization necessitates engagement with the new residents moving to cities and those born there, as the next generation grapples with the power, promise, and challenges that urban centers present. Cities are becoming increasingly significant as economic hubs, playing a vital role in addressing climate change and promoting sustainable development. Politically and culturally, cities are at the forefront of openness and innovation.
The world population is projected to reach 9.8 billion by 2050, and 11.2 billion by 2100.
Similarly, Africa is experiencing high rates of population growth, with 26 African countries expected to double their populations between 2017 and 2050.
The concentration of global population growth in the poorest countries poses considerable challenges for governments as they strive to implement the 2030 Agenda for Sustainable Development. This agenda aims to eradicate poverty and hunger, enhance health and education systems, achieve gender equality and women's empowerment, reduce inequality, and ensure that no one is left behind.
The report also highlights that a decline in fertility levels leads not only to slower population growth but also to an aging population. By 2050, the number of individuals aged 60 or above is expected to more than double from 962 million today to 2.1 billion, and by 2100, it will exceed 3.1 billion.
Before and after pictures are striking! We all appreciate witnessing the transformation of outdated or crumbling public spaces coming to life again. Urban architecture worldwide has undergone a remarkable resurgence in reimagining urban spaces. From entirely new skylines to greener public areas, we’ve compiled a collection of 40 examples showcasing amazing urban transformations, complete with before and after photos.
Get inspired by the "before and after" and consider the possibilities within the ever-evolving urban landscapes in your city.
Urban Transformation: The Future of Sustainable Cities
Guadalupe Bridge in Pasig is one of the busiest transport infrastructures in Metro Manila. Up to 141,000 vehicles pass through the Guadalupe Bridge daily on average, according to the Metropolitan Manila Development Authority (MMDA)
The Jones Bridge in Manila is a fine example of architectural beauty in the Philippines
Dubai Skyline – Before and After Urban Transformation of Dubai
The Climate Urban Transformation
Addressing Climate Change
Slowing climate change is our goal—and it can be achieved through two main strategies. We can either reduce the volume of greenhouse gases (GHG) in the atmosphere or reflect bands of sunlight back into space. The first strategy—reducing GHG—has been the primary focus of governmental action, which is appropriate given that for the past 170 years, society has extracted trillions of tons of coal, oil, and gas, burned them, and released heat-capturing particles into the atmosphere. We created this problem, and we have the capacity to undo the damage. The second strategy—reflecting sunlight—has been less explored. Currently, neither the federal government nor the State of California is promoting solar reflection as a means of combating climate change. While Climate Resolve has made local strides with cool roofs and cool pavements, these efforts were primarily aimed at protecting communities from extreme heat as a result of urbanization. Our rapidly growing civilization has dramatically altered the earth’s solar energy budget. Society’s use of dark-pigmented materials converts sunlight into heat, much of which is captured by greenhouse gases and re-radiated back to the earth, exacerbating the main mechanism of climate change. In California alone, where there was once grassland and chaparral, we’ve built hundreds of millions of lane miles of dark asphalt streets and millions more asphalt-shingled homes, highlighting the need for sustainable development.
Climate Change and Cities
Second Assessment Report of the Urban Climate Change Research Network (ARC3.2), 2018
2018, Cambridge University Press
Climate Change and Cities: Second Assessment Report of the Urban Climate Change Research Network. The Urban Climate Change Research Network’s Second Assessment Report on Climate Change in Cities (ARC3.2) is the second in a series of global, science-based reports that examine climate risk, adaptation, and mitigation efforts in the context of urbanization. This book explicitly explores the implications of changing climatic conditions on critical urban physical and social infrastructure sectors and intersectoral concerns, emphasizing the importance of sustainable development. The ARC3.2 Report presents downscaled climate projections and catalogs urban disasters and risks, along with their effects on human health in cities. It offers concrete solutions for urban areas regarding climate change mitigation and adaptation, urban planning and design, equity and environmental justice, and the roles of economics, finance, and the private sector. Key focus areas include critical urban sectors such as energy, water, transportation, housing and informal settlements, and solid waste management, as well as governing carbon and climate in cities. Other essential topics encompass ecosystems, biodiversity, and urban coastal zones. The primary aim of ARC3.2 is to inform the development and implementation of effective urban climate change policies, leveraging ongoing and planned investments for populations in cities across developing, emerging, and developed countries. This volume, like its predecessor, will be invaluable for a wide range of audiences involved with climate change and urbanization, including mayors, city officials, and policymakers; urban planners; and a broad spectrum of researchers and advanced students in the environmental sciences.
Citation: Rosenzweig, C., Solecki, W., Romero-Lankao, P., Mehrotra, S., Dhakal, S., & Ali Ibrahim, S. (Eds.). (2018). Climate Change and Cities: Second Assessment Report of the Urban Climate Change Research Network. Cambridge University Press.
CLIMATE CHANGE AND CITIES
Third Assessment Report on Climate Change and Cities (ARC3.3) 2025
Cities have emerged as leaders in both mitigation and adaptation to climate change, with a growing interest in their role in sustainable development amidst ongoing urbanization. A crucial need exists for the synthesis of recent research in key areas to enhance the identification, implementation, and assessment of effective climate solutions and successful responses.
ARC3.3 provides the latest synthesis of climate change impacts on cities while offering new scientific research and straightforward urban policy recommendations that support sustainable development.
This international assessment, ARC3.3, represents a collaborative effort of over 300 expert authors from cities in low, middle, and high-income countries around the globe. This peer-reviewed work contains benchmarked knowledge and city projections for urban climate change researchers, city practitioners, and policymakers at all levels of governance, motivating rapid action in response to urbanization challenges.
Published by Cambridge University Press under their Elements Series on Climate Change and Cities, digital ARC3.3 publications will be available on the Cambridge website starting in mid-February 2025 through late 2026.
Learning from COVID-19 for Climate-Ready Urban Transformatio
The COVID-19 pandemic has revealed gaps in city readiness for simultaneous responses to pandemics
Cities have faced significant challenges over the past three years due to the COVID-19 pandemic, while also grappling with intensified heatwaves, floods, and droughts driven by climate change. To ensure sustainable development, cities must effectively address both climate and public health crises, all while tackling poverty and inequity, often amidst economic pressure and declining trust in government. The COVID-19 pandemic has highlighted deficiencies in urban preparedness for simultaneous responses to pandemics and climate change, particularly in the Global South. However, these overlapping challenges present a unique opportunity to rethink current urbanization patterns and the economic dynamics they foster. This Element focuses on understanding the impact of COVID-19 on city systems concerning climate change mitigation and adaptation, exploring warnings, lessons learned, and calls to action. This title is also available as open access on Cambridge Core.
BPBA Consultant - 5- Pathways to Urban Transformation
Pathways to Urban Transformation
Five pathways to urban transformation emerge throughout ARC3.2, providing a foundational framework for the successful development and implementation of climate change action in the context of sustainable development. Cities that are making progress in transformative climate change initiatives are often following many, if not all, of these pathways. These pathways can guide hundreds of cities—regardless of size or income level—around the world to play a significant role in addressing climate change. Conversely, cities that do not adhere to these pathways may struggle to realize their potential as centers for climate change solutions. The pathways are:
Pathway 1: Disaster risk reduction and climate change adaptation serve as cornerstones of resilient urbanization. Integrating these activities into urban development policies requires a new, systems-oriented, multi-timescale approach to risk assessments and planning that takes into account emerging conditions within specific, vulnerable communities and sectors, as well as across entire metropolitan areas.
Pathway 2: Actions that reduce greenhouse gas emissions while increasing resilience present a win-win scenario for sustainable development. Prioritizing the integration of mitigation and adaptation strategies in urban planning, design, and architecture is essential. A diverse portfolio of approaches is available, including engineering solutions, ecosystem-based adaptation, policies, and social programs. It is crucial to consider the local context of each city to select actions that yield the greatest benefits.
Pathway 3: Risk assessments and climate action plans co-generated with a wide range of stakeholders and scientists prove to be most effective. Inclusive, transparent, participatory, multi-sectoral, multi-jurisdictional, and interdisciplinary processes enhance relevance, flexibility, and legitimacy in climate change initiatives.
Pathway 4: The needs of the most disadvantaged and vulnerable citizens must be addressed in climate change planning and action. Urban poor, the elderly, women, minorities, recent immigrants, and other marginalized populations frequently face the greatest risks associated with climate change. Promoting equity and justice within climate action not only boosts a city’s capacity to respond to climate challenges but also enhances human wellbeing, social capital, and opportunities for sustainable social and economic development.
Pathway 5: Enhancing city creditworthiness, developing robust urban institutions, and participating in city networks are crucial for effective climate action. Accessing both municipal and external financial resources is necessary to fund climate change solutions. Effective urban climate governance demands longer planning horizons, efficient implementation mechanisms, and coordination. Connecting with national and international capacity-building networks strengthens the success of city-level climate planning and implementation.
Climate change - A final word on timing:
Cities need to start immediately to develop and implement climate action.
The world is entering the most significant period of urbanization in human history, coinciding with a rapidly changing climate. Initiating action now will help avoid locking in counterproductive long-lived investments and infrastructure systems, ensuring that cities can harness their potential for sustainable development and lead in climate change solutions. - BPBA
The most substantial global power shift has been the world’s urbanization, which made its first notable advances during the 18th century’s industrial revolution. Since 1950, the number of urban dwellers has surpassed rural inhabitants, marking a crucial turning point in human history.