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Global warming has negative effects on crops, and in a few years, some foods may disappear, warns scientists. With the climate warmer and more humid, some of the basic ingredients in our diet are in danger, including maple syrup, salmon, wine, chocolate and coffee, according to four recent studies quoted by NBC News. In addition, there are other issues. For example, a bacterium that has spread to Florida, the United States, makes citrus more acre, while a fungus species destroys coffee and banana crops in South American countries. "We are in the midst of a dramatic attack on food safety," said Dr. Robert S. Lawrence, director of a research center on diet, food, the environment, and public health. But all these things are caused by global warming, which destroys cultures that have already been weakened by genetic mutations and chemical treatment, some experts have noted. In the past, there have been many cases of famine, but these have taken place in restricted areas, so the population has been able to move elsewhere to continue their lives. But the present situation is all the more serious as the phenomenon has spread worldwide. "People can only run on other planets. We need to take these issues into account and make decisions that will lead to lower carbon dioxide emissions," Lawrence said. Last week, the CO2 concentration in the atmosphere reached a huge level of nearly 400 parts per million (ppm), as it was 313 ppm in 1958. "Warmer and wetter air (a phenomenon caused by higher levels of carbon dioxide) creates conditions for the spread of pathogens, as is the case with citrus and banana," added Lawrence. The need for food The need for food is huge, because the world's population is growing. Under these conditions, there are more exports, and bacteria and fungi that attack fruit and vegetables can spread very quickly all over the world. In addition, to feed so many people, farmers use various chemicals or genetically modified foods. "For example, maize is grown at a shorter distance from each other and crops are higher than in the past, because we have designed them to be. They produce more food, but it sensitizes the plant to disease, warned Lee Hannah, from a nonprofit organization that sustains sustainable agriculture policies. This NGO showed in a study that areas with grape vines will be reduced by 70% by 2050. But perhaps the lack of wine on the tables will cause humankind to take measures to reduce pollution, Lawrence says.