Definition. Thoracic surgery is the repair of organs located in the thorax, or chest. The thoracic cavity lies between the neck and the diaphragm, and contains the heart and lungs (cardiopulmonary system), the esophagus, trachea, pleura, mediastinum, chest wall, and diaphragm.
If youâre reading this, chances are you switched on a light. But for the 1.3 billion people around the world who lack access to electricity, darkness is a reality. There is no electric light for children to do their homework by, no power to run refrigerators that keep perishables or needed medicine cold, no power for cooking stoves or microwaves.
So if a world population of 11 billion is probably unsustainable, how many people, in theory, could Earth support? Bradshaw says that it is nearly impossible to say what this number would be, because it is entirely dependent on technologies like farming, electricity production and transport â and on how many people we are willing to condemn to a life of poverty or malnutrition.