Short answer
Prioritize design strategies that maximize the utility and longevity of materials within their intended applications, rather than solely focusing on material extraction and disposal.
- Field
- Resource Management
- Source
- Proceedings of the National Academy of Sciences (2017)
- Method
- Dynamic stock-flow modelling and material flow analysis.
- Evidence
- Strong effect
The accumulation of human-made material stocks, such as buildings and infrastructure, has dramatically increased over the past century, now consuming approximately half of all annually extracted global resources. This resource management research insight is drawn from a 2017 study published in Proceedings of the National Academy of Sciences. Using Dynamic stock-flow modelling and material flow analysis., researchers explored how this design variable affects real-world outcomes. The key design takeaway: Prioritize design strategies that maximize the utility and longevity of materials within their intended applications, rather than solely focusing on material extraction and disposal.
Global Material Stocks Have Increased 23-Fold, Demanding Half of Annual Resource Extraction
The accumulation of human-made material stocks, such as buildings and infrastructure, has dramatically increased over the past century, now consuming approximately half of all annually extracted global resources.
Proceedings of the National Academy of Sciences · 2017
Key Findings
- 01Global material stocks increased 23-fold between 1900 and 2010, reaching 792 Petagrams.
- 02Approximately 50% of annual global material extraction is used for building or renewing these in-use material stocks.
- 03Recycling currently contributes only 12% to the inflow of materials into stocks, indicating that continuous stock growth limits the effectiveness of circular economy strategies.
- 04Future growth in emerging economies could lead to a fourfold increase in global stocks, potentially exceeding climate change targets.
Application
Design takeaway
Prioritize design strategies that maximize the utility and longevity of materials within their intended applications, rather than solely focusing on material extraction and disposal.
How to apply
When designing new products or systems, consider how they contribute to or interact with existing material stocks. Explore opportunities for product-as-a-service models, modular design for easier repair and upgrades, and material passports to track and facilitate reuse.
Project actions
- 01When researching materials for your design project, consider not just their properties but also their potential to become part of long-term material stocks.
- 02Investigate how your design could either contribute to or alleviate the demand for new material stock accumulation.
Method & Evidence
Variables
Strengths & Limitations
Strengths
- +Provides a comprehensive global perspective on material stock dynamics.
- +Integrates economic, resource, and environmental factors into a single model.
Limitations
Data for material stocks can be difficult to obtain globally, and models rely on assumptions about material use patterns.
Reliability & validity
The study's validity relies on the accuracy of global material flow data and the robustness of the stock-flow modelling approach. Reliability is enhanced by using a dynamic model that accounts for changes over time.
Think critically
Given that continuous stock growth is a major driver of resource use, how can design innovation shift focus from material throughput to maximizing the value and service derived from existing material stocks?
Design Principles
"Design for stock-flow efficiency: Minimize the net accumulation of materials in long-term stocks by maximizing utilization, extending lifespan, and facilitating reuse and repair."
This insight highlights the significant and often overlooked environmental impact of material stocks. Understanding these stock-flow dynamics is crucial for designers and engineers aiming to develop more sustainable products and systems, as it reveals the long-term resource implications of design choices.
What This Means for Your Design
We've built up so much stuff (like buildings and roads) over the last 100 years that it now takes up half of all the new materials we dig up each year. Even recycling isn't enough to stop this growth.
How to use in your project
- 1.Reference this study when discussing the environmental impact of material choices, particularly concerning the lifecycle of products and infrastructure.
- 2.Use the findings to justify design decisions aimed at reducing material consumption and promoting resource efficiency.
Add to My Project
Quick Cite
Paragraph starter
The exponential growth of global material stocks, which has increased 23-fold over the 20th century, now accounts for approximately half of all annual resource extraction. This phenomenon, driven by the accumulation of materials in buildings, infrastructure, and machinery, highlights the limitations of solely relying on recycling to achieve sustainability. Design projects must therefore consider strategies that enhance the utilization and longevity of existing material stocks, such as designing for durability, repairability, and modularity, to mitigate future resource demands and environmental impacts.
Source
Proceedings of the National Academy of Sciences
Global socioeconomic material stocks rise 23-fold over the 20th century and require half of annual resource use
journal · 2017
View sourceQuestions About This Research
- What does the research say about global material stocks have increased 23-fold, demanding half of annual resource extraction?
- Prioritize design strategies that maximize the utility and longevity of materials within their intended applications, rather than solely focusing on material extraction and disposal. Evidence: Proceedings of the National Academy of Sciences (2017).
- Why does "Global Material Stocks Have Increased 23-Fold, Demanding Half of Annual Resource Extraction" matter for design?
- This insight highlights the significant and often overlooked environmental impact of material stocks. Understanding these stock-flow dynamics is crucial for designers and engineers aiming to develop more sustainable products and systems, as it reveals the long-term resource implications of design choices.
- How can designers apply this research?
- Prioritize design strategies that maximize the utility and longevity of materials within their intended applications, rather than solely focusing on material extraction and disposal.
- What were the main findings?
- Global material stocks increased 23-fold between 1900 and 2010, reaching 792 Petagrams.. Approximately 50% of annual global material extraction is used for building or renewing these in-use material stocks.. Recycling currently contributes only 12% to the inflow of materials into stocks, indicating that continuous stock growth limits the effectiveness of circular economy strategies.. Future growth in emerging economies could lead to a fourfold increase in global stocks, potentially exceeding climate change targets.
- What research method was used?
- Dynamic stock-flow modelling and material flow analysis..
- How strong is the evidence?
- Evidence strength is rated Strong effect, based on a 2017 journal from Proceedings of the National Academy of Sciences.
- What should I do differently in my next project?
- When designing new products or systems, consider how they contribute to or interact with existing material stocks. Explore opportunities for product-as-a-service models, modular design for easier repair and upgrades, and material passports to track and facilitate reuse.
- What are the limitations?
- The model relies on estimations and data availability, which may introduce uncertainties. Future projections are based on current trends and economic assumptions.