#1. What is the primary cause of the global warming trend observed since the mid-20th century?

#2. Which gas is considered the most important long-lived "forcing" of climate change?

#3. Which gas, on a molecule-for-molecule basis, is more active as a greenhouse gas than carbon dioxide?

#4. What is the primary source of carbon dioxide released into the atmosphere?

#5. Which greenhouse gas is both produced by soil cultivation practices and fossil fuel combustion?

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