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”Cap and trade” systems in which corporations that exceed their allotment of carbon dioxide emissions are allowed to purchase certificates from those with low emissions were designed to combat global climate change by giving polluters a financial incentive to reduce or offset their impact on the environment. But carbon markets in Europe and elsewhere are increasingly falling victim to fraud in the form of phishing bribery and other schemes. Wharton experts and others say combating these crimes is a complicated problem which thus far has no clear solution. See acast.com/privacy for privacy and opt-out information.