Yes, the climate has always changed.

But, the speed of recent change is unprecedented.

More importantly, we understand why.

Burning fossil fuels & deforestation adds carbon dioxide to the atmosphere which warms the planet.

Simple physics. Understood for more than a century.

#EarthDay

@ed_hawkins

What is the variation wrt?

@Pampa @ed_hawkins arithmetic mean over the dataset.

@stripey @ed_hawkins

Hmm, that's both odd (picking neither a base around the sole "Invention of the Steam Engine" event singled out, nor a pre-industrial average) and surprising (it certainly doesn't look like that from the graphic.)