The Copenhagen Accord of 2009 required most industrial nations to reduce their carbon dioxide and other greenhouse-gas emissions during the ensuing decade by 5 to 40 percent, depending on the country. The United States and Canada, for example, committed to reducing emission by 17 percent while India commited to a 20–25 percent reduction, Mexico 30 percent, Israel 20 percent, and so on. Is such an agreement efficient? Explain why or why not.