Martinez is one of 21 young people taking Trump and members of his administration to federal court over inaction on global warming. On Saturday, several of these “climate kid’ plaintiffs — the youngest is 9 — will walk alongside the chanting and sign-pumping adults at the March for Climate, Jobs and Justice in Washington. That demonstration is a call for a clean energy revolution, and it’s expected to draw thousands. Perhaps fittingly, local forecasts call for potentially record-setting temperatures above 90 degrees Fahrenheit. Demonstrators plan to converge on the White House.