Ban Ki-moon served as the eighth secretary-general of the United Nations and Patrick Verkooijen is CEO of the Global Center on Adaptation, a group that seeks to facilitate climate adaptation by working with the public and private sectors. The opinions in this commentary are their own. View more opinion at CNN. (CNN)Crises tend to bring out some of the best and the worst in us. We have watched in awe and admiration as health care professionals have responded with superhuman dedication to the Covid-19 pandemic. We have heard neighbors serenading each other across balconies. Car manufacturers are retooling to produce respirators and face masks that are so desperately needed by hospitals right now. Around the world, 1.7 billion people are staying at home to slow down the spread of the virus, according to The Guardian. Never, it seems, have there been so many visible acts of collective solidarity, and of such magnitude.But there have also been acts of craven selfishness. Cyberattacks on Spanish hospitals, where thousands are in intensive care. Profiteering and hoarding of life-saving medical supplies. World leaders who put their citizens in danger by denying the gravity of the situation.What this shows is that as individuals and as

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