All over the world by the unexpected impact of the economic formwork for Corona onset of Los Angeles drops on blue sky and clear water in places from Venice to Beijing to Bangalore, where he dominated only a few weeks from contamination. COVID-19 has driven the global economy to a virtual standstill as the pandemic sweeps the globe. Air pollution is formed with factories and cars parked in the garage dissipated in the cities. The Chinese capital of Beijing, known for the content of the lung choking toxic pollution that surround the city, has the unusual sight of the clear sky was closed factories in the production area. Since the main problems of China with the air pollution that causes about 1 million premature deaths each year, reducing unexpected relief offered. But experts in science and environmental policy warn not to mention a silver lining on the horizon; A sustainable reduction of emissions and pollution should be done in a way that does not completely break up the company. And then, they expect that the pollution will return when the crown flows and may return in some cases with a vengeance. “I see it and I do not think of a silver lining,” says Wade McGillis, associate professor of earth and environmental engineering at Columbia University. “I see him, and I think:. The poor people who are not moving to protected and in its place, and ruin their lives” In the short term, the change seems to be a miracle. The European Space Agency’s satellite images show the levels of nitrogen dioxide reduced, causing a by-product of burning fossil fuels, respiratory problems, locking in major cities of the continent, including Paris, Madrid and Rome as countries and limit the journey . Cities in the US have similar effects to the Americans to internal market remains on the prone cities like Los Angeles and New York to see. In China, the largest emitter of greenhouse gases worldwide carbon dioxide emissions fell by a quarter in mid-February for a couple of weeks earlier, according to an analysis published in the carbon letter. Scientists similar declines in other pollutants such as nitrogen dioxide and particulate matter in the country that has spent years looking the air in smog choked cities to clean. “In terms of a shift or a change that actually happened during the night, this was unheard dramatic,” says Lauri Myllyvirta, author of Carbon short report and senior analyst at the Research Center for Energy and the clean air . In theory, this sharp drop in pollution and carbon dioxide emissions is a positive development for the planet and the people living on it. First, air pollution caused millions of deaths every year around the world bears, aggravate cardiovascular and respiratory diseases. the clearer air may also provide some brief relief to those suffering from COVID-19, making it easier for patients to breathe, fighting, although health experts say that years of exposure to pollution has probably made many people more susceptible to the disease. “The damage is already done,” said Sascha Mars Chang, general secretary of the European Public Health Alliance in an act communicated. “Years of breathing dirty air from traffic fumes and other sources, the health of all those who are now embroiled in a struggle for life or death weakened.” The drop in emissions can also be a victory for the fight against climate change it seems to be. The climate scientists have warned that global carbon dioxide emissions of the tips must have in the coming years for the world even a remote chance of keeping temperatures to rise more than 1.5 ° C by the end of the century, a likely level involve a number of my dramatic consequences of climate mass migration to the loss of coral reefs in the world. As economic carbon dioxide emissions crown consequences may fall in 2020. But without a concerted effort, it is unlikely to stay down. The situation in China shows how fast emissions and associated air pollution can recover. At the end of March pollution consumption of coal and nitrogen dioxide it was returned to normal levels, according Myllyvirta. A bigger question in the long term remains: the country will use this time to finance green stimulus measures to boost economic growth? This infrastructure program for clean energy and improve energy efficiency, although the sturdy support could extend to green infrastructure, the sharp drop in air pollution and short-term issues, at least not yet, not maintain fast. Around the world, policy makers must answer such questions. If politicians take a concentrated effort and incurred to decarbonise our economy, clear skies today gives us a preview of what will be, if it takes decades to get yourself to get there.