University of Hawaii researchers look at deadly heat waves caused by global warming.<br />The conclusion is clear: if greenhouse gas emissions greenhouse gas emissions do not decrease, 74% of the human population is expected to die of heat within 80 years.<br />Tropical areas would be the first victims because of the humidity and temperatures that are already very high.<br />These regions would then be unlivable for the Man. <br />But the big cities would not be spared either.<br />According to the study, by 2100, New York City could have about 50 days of potentially deadly heat, 40 days for Los Angeles, 20 days for Sydney...<br />The situation would be even more critical in cities such as Orlando (Florida) and Houston (Texas) with over 90 days of life-threatening heat.