Because of stories like this (from the Guardian, of course).
A changing climate isn’t just about floods, droughts and heatwaves. It brings erupting volcanoes and catastrophic earthquakes, says Bill McGuire in London.
The idea that a changing climate can persuade the ground to shake, volcanoes to rumble and tsunamis to crash on to unsuspecting coastlines seems, at first, to be bordering on the insane. …. The fact that it does reflects a failure of our imagination and a limited understanding of the manner in which the different physical components of our planet – the atmosphere, the oceans, and the solid earth, or geosphere – intertwine and interact.
If we think about climate change at all, most of us do so in a very simplistic way: so, the weather might get a bit warmer; floods and droughts may become more of a problem and sea levels will slowly creep upwards. Evidence reveals, however, that our planet is an almost unimaginably complicated beast, which reacts to a dramatically changing climate in all manner of different ways; a few – like the aforementioned – straightforward and predictable; some surprising and others downright implausible. Into the latter category fall the manifold responses of the geosphere.
Disagree? You’re a simpleton with limited understanding. That includes every scientist on earth.