I would go with climate change. The effects are not will never be consistent across the entire globe. Some areas will be warmer, some colder and some under water. You will experience extremes of all kinds of weather phenomena and even, according to some, if you bury your head deep enough in the sand, it will not exist at all. Which is, of course, pure bullshit. The climate has, is and will change. That is what it does. Deniers cannot say it isn’t happening, they just don’t want you to blame humans for it, which is fine, again, bullshit, but fine.