This post was contributed by Frank F. Islam as part of our April spotlight series on sustainability and the environment. Frank is an entrepreneur, civic leader and thought leader based in Washington, DC. The views expressed here are his own.   On April 22, 2020, when most of the world celebrated the 50th anniversary of Earth Day, the United States did not participate. On Earth Day this year, the U.S. will do more than participate.    President Joe Biden will host a Leaders’ Climate Summit on Earth Day. The Summit will commemorate the signing of the Paris Agreement five years ago, and...