• All
• 1930s0
• 1940s0
• 1950s0
• 1960s0
• 1970s0
• 1980s0
• 1990s1
• 2000s1
• 2010s0

• All
• Environment 2
• Other 4
• Religion / Belief 25
• Social Issues 1

• Energy Conversion 3
• Chernobyl Disaster 2
• Christianity 2
• Energy 2
• Methane 2
• Nuclear Power 2
• Nuclear Reactor Technology 2
• Nuclear Technology 2
• Pope Benedict Xvi 2
• Pope John Paul Ii 2
• 921 Earthquake 1
• Academia 1
• Actinides 1
• Activated Sludge 1
• Anaerobic Digestion 1

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