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Sustainable development means achieving economic growth that is widely shared and that protects the earth's vital resources. Our current global economy, however, is not sustainable, with more than one billion people left behind by economic progress and the earth's environment suffering terrible damage from human activity. Sustainable development requires mobilising new technologies that are guided by shared social values.
United Nations Secretary-General Ban Ki-moon has rightly declared sustainable development to be at the top of the global agenda. We have entered a dangerous period in which a huge and growing population, combined with rapid economic growth, now threatens to have a catastrophic impact on the earth's climate, biodiversity and fresh-water supplies. Scientists call this new period the Anthropocene - in which human beings have become the main causes of the earth's physical and biological changes.
The Secretary-General's Global Sustainability Panel has issued a new report that outlines a framework for sustainable development. The GSP rightly notes that sustainable development has three pillars: ending extreme poverty; ensuring that prosperity is shared by all, including women, youth and minorities; and protecting the natural environment. These can be termed the economic, social and environmental pillars of sustainable development, or, more simply, the "triple bottom line" of sustainable development.
The GSP has called for world leaders to adopt a new set of Sustainable Development Goals (SDGs) that will help to shape global policies and actions after the 2015 target date for achieving the Millennium Development Goals (MDGs). Whereas the MDGs focus on reducing extreme poverty, the SDGs will focus on all three pillars of sustainable development: ending extreme poverty, sharing the benefits of economic development for all of society and protecting the Earth.
It is, of course, one thing to set SDGs and quite another to achieve them. The problem can be seen by looking at one key challenge: climate change. Today, there are seven billion people on the planet, and each one, on average, is responsible for the release each year of a bit more than four tonnes of carbon dioxide into the atmosphere. This CO2 is emitted when we burn coal, oil and gas to produce electricity, drive our cars, or heat our homes. All told, humans emit roughly 30 billion tonnes of CO2 per year into the atmosphere
http://www.aljazeera.com/indepth/opinion/2012/

Hi
First of all do not depend on your college for placement. Second during your summer break search for internship in the corporate. It will help you to understand gap between the academic skill and actual corporate demand and it will also let your prospective employer to judge you. Third, search on job portals and LinkedIn for career opportunity available for engineering freshers and fix the area where you want to make career, if required go for professional certification, next improve your soft skills such as answering interview questions, communication skills, confidence, personality and grooming. Last update yourself on whatever is happening in the world related to your academic and work area. This will surely help.