Friday, April 22, will mark the 47th Earth Day. At this year’s high-level celebration at the United Nations headquarters in New York, the Paris Climate Agreement will officially be signed. Thirty days after its signing by at least 55 countries that represent 55 percent of global greenhouse gas emissions, the agreement will take effect--committing countries to establishing individual targets for emission reductions with the expectation that they will be reviewed and updated every five years.
