What is the biggest influence on human health?

Global warming will lead to air and water pollution, more flood-related accidents, threats to human food supply, millions of environmental refugees, pressure on many ecosystems with air and water purification functions, and even ecosystem collapse. All these will be harmful to human health. Recently, at the annual meeting of the American Geological Society held in Philadelphia, USA, Cindy, MD, from the Bloomberg School of Public Health, Johns Hopkins University, Baltimore? Parker gave a keynote speech on the health hazards of global warming. She said: "When most people think about temperature changes, they only think about the pressure brought by the heat wave, because the heat wave that swept through Western Europe in 2003 killed more than 30,000 people. With climate change, the heat wave will become more serious and last longer. " According to her point of view, although "with climate change, the heat wave will become more intense and last longer", some indirect effects of global warming have actually caused more harm to human beings than the most direct effects. She said that last year's hurricane Katrina was enough to give people a glimpse of the whole leopard. At that time, the water taken away by the hurricane was far greater than the loss caused by the strong wind itself According to the research of climate scientists, global warming will lead to stronger storms and hurricanes and more water. The floods caused by hurricanes have brought about direct or indirect health problems. When Hurricane Katrina hit, the evacuation in New Orleans was not ideal. However, Parker said, to make matters worse, the largest medical centers in big cities are built in the city center, and it is obvious that people can't evacuate them and other major infrastructure. In fact, among the 20 largest cities in the world, 13 are located by the sea, and the topography is not much different from the sea level. Parker pointed out that global warming leads to rising sea level, and seawater will threaten emergency rescue organizations such as medical institutions, water treatment plants, fire stations or medical rescue teams. Most service departments that protect people's health in big cities are usually at sea level. One of the most basic and important needs of human health is clean water. However, climate change poses a threat to water supply and water quality in many parts of the world. Parker said that even without climate change, there is a shortage of water supply around the world. However, in the case of climate change, the distribution of rainfall will change accordingly, which means that the problems of drought and famine will become more prominent. Parker believes that the continuous degradation of the ecological system around human beings and the deterioration of the quality of water resources are twin brothers that affect people's lives. She explained that people rely on ecosystems to provide us with the most basic services. Although human beings have advanced technology, our life cannot be separated from clean water, clean air and soil that provides us with food. A healthy ecosystem provides people with these basic and indispensable necessities. For example, forests absorb carbon dioxide from the environment and release oxygen necessary for animal life through photosynthesis. Similarly, in terms of water resources, good ecosystems (such as forests and wetlands) can filter out many toxins in water and provide people with clean drinking water. At present, 6.5438+0.8 million people (most of them children) die of dysentery every year because of drinking polluted water. Parker said that this situation will be aggravated by climate change. Another basic human need is food. Parker said that in the face of global warming, food has become a problem that people have to face because climate change will greatly change the way we grow crops. Research shows that climate change has more negative effects on crops than people think.