6.10 Impact of Increased Connectivity on the Environment

Increased connectivity — the global expansion of the internet, mobile networks, and billions of connected devices — has brought enormous benefits to society. However, it also carries significant environmental costs that must be understood and managed responsibly.

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Negative Environmental Impacts

1. E-Waste (Electronic Waste)

E-waste refers to discarded electronic devices — smartphones, routers, laptops, servers, and networking hardware — that have reached the end of their useful life.

• The rapid turnover of mobile devices (frequent upgrades) generates millions of tonnes of e-waste annually.
• E-waste often contains hazardous materials including:
  • Lead ($Pb$) — used in solder and older CRT monitors; leaches into soil and groundwater.
  • Mercury ($Hg$) — found in fluorescent backlights; toxic to the nervous system.
  • Cadmium ($Cd$) — present in rechargeable batteries; a known carcinogen.
  • Brominated Flame Retardants (BFRs) — used in circuit boards; release toxic gases when burned.
• Improper disposal in landfills allows these toxins to contaminate ecosystems.

2. High Energy Consumption

The infrastructure supporting global connectivity consumes enormous amounts of electricity:

• Data Centers — must operate 24/7 to serve billions of users. A significant portion of their energy is used for cooling systems to prevent server overheating.
• Network Infrastructure — routers, switches, cell towers, and undersea cables all require continuous power.
• Device Manufacturing — producing billions of smartphones, tablets, and IoT devices requires energy-intensive industrial processes.
• Much of this electricity is still generated from fossil fuels, contributing to greenhouse gas emissions.

3. Carbon Footprint of Digital Connectivity

The carbon footprint of ICT is the total amount of greenhouse gases — primarily carbon dioxide ($C{O}_2$) — emitted during:

1. Production of ICT hardware (mining raw materials, manufacturing).
2. Usage of devices and data centers (electricity consumption).
3. Disposal of equipment (incineration or landfill decomposition).

The global ICT sector is estimated to contribute approximately 2–4% of global $C{O}_2$ emissions, comparable to the aviation industry.

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Positive Environmental Impacts

Increased connectivity also enables technologies and behaviours that reduce environmental harm:

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Green Computing

Green Computing (also called Green IT) refers to the design, manufacture, use, and disposal of computing resources in an environmentally responsible and energy-efficient manner.

Key strategies include:

• Using energy-efficient hardware (e.g., low-power processors).
• Powering data centers with renewable energy (solar, wind).
• Proper recycling of e-waste through certified facilities.
• Virtualisation — running multiple virtual servers on one physical machine to reduce hardware needs.
• Designing products for longevity and repairability to slow device turnover.

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Summary