Memorials were held around Japan and across the world Sunday to mark last year’s earthquake and tsunami that killed about 20,0000 people and triggered a meltdown at the Fukushima Daiichi nuclear power plant. It was the world’s worst nuclear disaster since Chernobyl. About 326,000 Japanese residents remain homeless, including 80,000 evacuated from the vicinity of the Fukushima facility. Authorities have imposed a 12-mile no-go zone around the plant, and residents may never be allowed back. On Sunday, more than 12,000 took part in an anti-nuclear protest in Tokyo forming a “human chain” around the parliament building.

Prentice Koo, anti-nuclear organizer with Greenpeace: “Although no one died right now, but everyone can forecast the impact of Fukushima will last for over a decade or even a century. So for Japan, this kind of well-developed country can’t even—even they can’t handle a nuclear disaster, so it’s really a strong lesson for everyone to know that when nuclear reactors go wrong, no one can control it.”