Environmental sustainability is the process of making sure that the current processes of interaction with environment is pursued with the idea of keeping the environment as pristine as naturally possible based on ideal-seeking behaviour. An ‘unsustainable situation’ occurs when natural capital(the sum total of nature’s resources) is used up faster than it can be replenished. Sustainability requires that human activity only uses nature's resources at a rate at which they can be replenished naturally. Inherently, the concept of sustainable development is intertwined with the concept of carrying capacity. Theoretically, the long-term result of environmental degradation is the inability to sustain human life. Such degradation one global scale could imply extinction for humanity.