Diseases, Health
Providing every human being on Earth with even basic health care would be very difficult, if not impossible. With the development of medicine and other sciences we are inventing new and new cures, medical equipment, methods...That is of course great, but that is not the main problem. The main problem is how to supply these in amounts, that would satisfy everyone who needs them. That is not just difficult, it is almost impossible. We can provide proper care just for a quite small part of the population.
We are unable to cure some of the current diseases, but that is once again just an easy part of this problem. We know that with the devastation of rainforests, high migration and quick travel systems, we can expect spreading of new diseases as well as the existing ones to populations not immune to them. Overpopulation certainly only helps spreading the epidemics. We can also expect new diseases from the ozone hole, fertilisers, some food, biological wars, terrorism and other factors, too
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