Because we keep asking "what if X is contributing to this", and then we get data on X, and it turns out it isn't.
One of the easiest-to-access renditions of this IMO can be found here;
https://www.bloomberg.com/graphics/2...ing-the-world/
That'll run you through graphs of various factors, and then combine those factors on the same plots, for comparison, to show that there's basically one factor that emerges as correlating to the change. Anthropogenic emissions. Natural factors are, if anything, contributing to a cooling trend, if we removed the anthropogenic contributions.
Yes. It's a consequence of the additional energy in the system and how that heat affects myriad natural cycles. It doesn't matter what the origin of that warming is, if you're simply concerned with the effects.If the Earth arbitrarily warmed by 1 degree Celsius through the natural rise and fall of climate change, would that automatically make droughts/heatwaves/hurricanes/floods worse or more frequent?
The reason the origin matters is because we're making it worse, and we could take steps to mitigate that.
Largely because, with the rapidity of change that's occurring, nearly every direction is a "bad direction". Human civilization rests upon a fairly fragile balance. Tipping that balance in any direction is bad.It would seem that there would be consequences both positive and negative. Yet all we seem to hear is that the Earth warming will cause every catastrophic climate shift to do so in a worse direction.
Droughts are bad for obvious reasons, but increased rainfall in previously-arid locations can wreak havoc on plant life that's adapted to a more-arid terrain, and can easily lead to huge amounts of erosion which can have major consequences downstream. Warmer temperatures may mean that permafrost is no longer permanently frosted, which will allow for plant life to eventually move northwards into those new soils, but in the short term, they mean that northern settlements that rest on that permafrost are sinking into the ground, the roads that lead to them are turning into impassable mud, and so forth.
Climate change is causing instability, and that instability is what poses the threat. Not which particular direction conditions may go in any particular region.