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“EARTH DAYS,” 8 p.m., KRMA-Channel 6 Forty years after the first Earth Day, PBS’s “American Experience” recounts the origins of the modern environmental movement from Rachel Carson’s “Silent Spring” to today’s green revolution. Among the featured champions of the cause: Stewart Udall, Paul Ehrlich, Stewart Brand.
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“How I Met Your Mother,” 7 p.m., KCNC-Channel 4 When Ted attends his mother’s wedding, he is disturbed by her overly affectionate relationship with her fiance.
Joanne Ostrow
