[GRADE 9] Ways of Measuring Development: Environmental Indicators

The Earth's population has grown significantly, from 3 billion in 1960 to 7 billion in 2011, and is projected to reach 9.6 billion by 2050. This growth puts increasing pressure on natural resources and the environment. Environmental indicators are used to measure the impact of human activities on the environment.

A key environmental indicator is the carbon footprint, which measures the amount of greenhouse gases, primarily carbon dioxide (CO2), produced by human activity in a year. Increased greenhouse gases contribute to climate change. CO2 is generated from burning fossil fuels for electricity, vehicle emissions, and industrial processes. The unit of measurement is tonnes of CO2 per capita.

Developed countries typically have a larger carbon footprint due to more industries, vehicles, and fossil fuel consumption. For instance, Australia, a developed country, has a carbon footprint of 16.5 tonnes of CO2 per capita annually, while Malawi, a developing country, has 0.1 tonnes. South Africa's carbon footprint is 9.3 tonnes per capita per year.

Another indicator of environmental development is the urban-rural population ratio. Developed countries typically have a higher urban population, while developing countries have a higher rural population. For example, 88% of Denmark's population lives in urban areas, compared to 88% of Burundi's population living in rural areas. South Africa's population is 64% urban.