Sustainable Development and the SDGs

For most of history, "development" meant growth at any cost, and that cost was often the environment. The world has slowly learned that this cannot last. Sustainable development is the idea that we must meet our needs today without destroying the planet for tomorrow. It has grown from a slogan into a global agenda: the Sustainable Development Goals. The SDGs are now central to modern environment and development studies.

The classic definition comes from the Brundtland Report of 1987: sustainable development is development that meets the needs of the present without compromising the ability of future generations to meet their own needs.

It rests on balancing three pillars at once:

• Economic growth and prosperity,
• Social well-being and fairness, and
• Environmental protection.

True progress, the idea holds, must serve all three together. Growth that wrecks the environment or leaves people behind is not real development.

Behind the definition lies an older ecological idea: carrying capacity. The carrying capacity of an environment is the maximum load of population and activity that its natural systems can support without breaking down. Sustainable development is, at its core, the demand that human development stay within the carrying capacity of the Earth's natural systems. The three pillars describe how to balance progress; carrying capacity sets the outer limit within which that balance must happen.

This warning was sounded loudly in 1972. The Club of Rome, a global think tank of scientists and policymakers, published a famous report called The Limits to Growth, prepared by a research team led by Donella and Dennis Meadows. Using early computer models, the report projected that if the existing trends in five areas continued unchanged, the planet would hit its physical limits within about a hundred years. The five trends it tracked were:

• Population: continued rapid growth in human numbers,
• Industrialisation: ever-expanding industrial output,
• Pollution: rising contamination of air, water and land,
• Food production: pressure to feed a growing population, and
• Resource depletion: the running down of non-renewable resources.

The report did not solve the problem, and its dates can be debated. Its lasting contribution was to place the idea of finite planetary limits at the centre of the development debate, fifteen years before the Brundtland definition gave the idea its famous wording.

The world has gathered repeatedly to turn this idea into action. The landmark was the Earth Summit held in Rio de Janeiro in 1992. There, nations adopted major agreements on climate change and biodiversity. They also agreed on a programme of action called Agenda 21.

Further summits followed. The Johannesburg Summit of 2002 reviewed progress a decade after Rio. Then came Rio+20 in 2012, formally the United Nations Conference on Sustainable Development, held once again at Rio de Janeiro twenty years after the original Earth Summit. Each pushed nations to integrate environmental care into development. Together, these conferences built the global framework within which countries now cooperate on the environment.

Rio+20 also produced a practical follow-up. After the conference, the United Nations launched the Partnership for Action on Green Economy (PAGE), a UN mechanism that helps countries shift towards greener and more inclusive economies. PAGE brings UN agencies together to support governments in reframing their economic policies around sustainability. Remember the pairing: PAGE came out of Rio+20, not out of the 1992 Earth Summit.

The agenda reached its fullest form in 2015, when the United Nations adopted the Sustainable Development Goals (SDGs), a set of 17 goals to be achieved by 2030.

The goals did not appear from nowhere in 2015. They were first proposed at the Rio+20 conference in 2012, where member states agreed to develop a set of universal goals to succeed the earlier Millennium Development Goals. Three years of negotiation later, the UN General Assembly adopted them. Be careful with a common trap: the SDGs were not proposed in 1972 by the Club of Rome. The Club of Rome's contribution that year was The Limits to Growth report on planetary limits; it had no role in proposing the SDGs, which emerged four decades later from the Rio+20 process.

The SDGs cover the whole sweep of human and planetary well-being, including:

• ending poverty and hunger,
• ensuring good health, education and clean water,
• providing affordable clean energy and decent work,
• achieving gender equality and reducing inequality, and
• taking climate action and protecting life on land and in the sea.

Almost every country adopted the SDGs. They are the world's shared to-do list for a fairer, more sustainable future. India has aligned many of its policies with them.