It's misleading to ask what Earth's 'ideal temperature' is. Here's what's really important

The most commonly asked questions about climate change, particularly from those who doubt the mainstream findings showing that greenhouse gases are warming the planet, tend to be zombies. They rear their heads again and again, only to seemingly die and then rise once more. 

This is the case with one particular question that a high-ranking U.S. official has been asking: How do we know the planet's "ideal temperature" years into the future? 

On its face, it seems like an innocent-enough inquiry. The Earth is warming in response to human-caused emissions of greenhouse gases, like carbon dioxide and methane, and world leaders have committed to limit warming to "well below" 2 degrees Celsius, or 3.6 degrees Fahrenheit, above pre-industrial levels by the year 2100. Why 2 degrees? That seems arbitrary, no? Read more...

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