Christian Science Monitor: When Germany pledged a “comprehensive and irreversible” end to nuclear power barely a decade ago, antinuclear activist Erhard Renz thought he’d won. Reassured that the Biblis nuclear power plant near his home would be turned off within years, Mr. Renz turned his green passions to installing solar panels. “We were convinced it was over,” he says. But Chancellor Angela Merkel’s decision to extend the life span of Germany’s 17 plants an average of 10 years beyond 2021, the date the …