Define technology and its impacts

Technology

Technology is the application of scientific knowledge, tools, skills and organised methods to make goods and services and to solve practical problems of human life. It includes hardware (tools, machines) and software (knowledge, methods, organisation). Examples: irrigation canal, hydropower plant, computer, vaccine.

Impacts on society

Positive:

• Health: vaccines, diagnostic machines and medicines have increased life expectancy and reduced child mortality.
• Communication: mobile phones and the internet connect people across the world instantly.
• Education: online learning, e-libraries and digital classrooms widen access.
• Economy and employment: higher productivity, new industries and jobs (IT, telecom, tourism).
• Transport: roads, vehicles and airlines connect remote areas to markets and hospitals.
• Empowerment: awareness, women's empowerment and transparency in governance.

Negative:

• Unemployment of unskilled workers due to mechanisation and automation.
• Inequality and digital divide between rich and poor, urban and rural.
• Cultural erosion, breakdown of joint families, consumerism.
• Health problems: sedentary life, screen and social-media addiction.
• Crime and war: cyber crime, weapons of mass destruction.

Impacts on environment

Positive:

• Renewable energy (hydro, solar, wind, biogas) reduces fossil fuel use.
• Water and wastewater treatment, recycling and waste-to-energy plants.
• GIS, remote sensing and early-warning systems help monitor forests, glaciers and floods.
• Energy-efficient devices (LED, electric vehicles) reduce emissions.

Negative:

• Air pollution from vehicles, brick kilns and industries (e.g. PM2.5 in Kathmandu valley).
• Water pollution from industrial effluents, pesticides and sewage.
• Deforestation and land degradation from roads, mining and urban expansion.
• Climate change from greenhouse gas emissions; glacier melting in the Himalaya.
• Solid waste and e-waste, plastic pollution, ozone layer depletion by CFCs.
• Loss of biodiversity due to habitat destruction.

Summary

Technology is a double-edged tool; its net effect depends on choosing appropriate, clean technologies and controlling harm through EIA, regulation and public awareness.