A mountain climber was killed and another was seriously injured when they fell 1,000 feet while trying to reach a peak in Alaska’s Denali National Park and Preserve. The dead climber was identified as Robbi Mecus, 52, a noted New York forest ranger from Keene Valley who advocated for expanding apline climbing for transgender people. The injured climber was a 30-year-old California woman who was not yet publicly identified Sunday morning. The deadly accident occurred late night Thursday on Mount Johnson, where the climbers, who were roped together, were scaling a steep approach known as “the Es…