Sustainable IT refers to the use of information technology in a way that supports environmental, social, and economic sustainability. Sustainable IT involves designing, developing, and using technology to minimize environmental impact, maximize social benefits, and contribute to economic growth.

Regarding used laptops, several sustainable IT practices can be applied to minimize their environmental impact, extend their lifespan, and support economic growth.     

Sustainable IT practices include:

1. Refurbishment and resale: Used laptops can be refurbished and resold, extending their lifespan and reducing the need for new laptops to be manufactured. This can help to conserve natural resources and reduce the environmental impact of laptop production.
2. Recycling: Laptops that are no longer functional or cannot be refurbished can be recycled. Recycling can help to recover valuable materials, such as metals and plastics, and reduce the environmental impact of e-waste.
3. Upgrading and repair: Laptops can be upgraded and repaired to extend their lifespan and reduce the need for manufacturing new laptops. This can help to conserve natural resources and reduce the environmental impact of laptop production.
4. Responsible disposal: Laptops that cannot be refurbished or recycled should be disposed of responsibly to minimize their environmental impact. This may involve working with e-waste management companies that follow responsible disposal practices.
5. Energy efficiency: Laptops designed to be energy-efficient can help reduce energy consumption and lower greenhouse gas emissions. Choosing energy-efficient laptops can help to minimize the environmental impact of laptop use.
6. Donation: Used laptops can be donated to non-profit organizations, schools, and other organizations that can put them to good use. This can help to promote social equity and support economic growth.
7. Cloud computing: Using cloud computing services can help reduce the environmental impact of IT infrastructure by reducing the need for on-premise servers and energy consumption.
8. E-waste management: Implementing e-waste management programs can help to reduce the environmental impact of IT equipment disposal by promoting reuse, recycling, and responsible disposal of e-waste.
9. Green data centers: Building data centers designed to be energy-efficient and use renewable energy sources can help reduce the environmental impact of data center operations.
10. Digitalization: Moving towards a digital economy can help to reduce paper consumption, promote remote work, and reduce the environmental impact of transportation.
11. Social impact: IT can be used to promote social equity by providing access to education, healthcare, and other services to underserved communities.

Overall, applying sustainable IT practices can help reduce IT operations' environmental impact, promote social equity, and support economic growth. By refurbishing, recycling, upgrading, and responsibly disposing of used laptops, organizations can extend their lifespan, reduce their environmental footprint, and improve their overall sustainability performance.