Alkaline earth is any plot of ground (no matter how small) where someone (even just one person) has spit out an alkaline (see alkaline) “treat” (even just one) because it tastes truly awful. Fortunately, alkaline is not widely available. Otherwise, many people might inadvertently buy and try alkaline. In that case, a large part of the Earth’s non-water surface (and much of the near-shore bottoms of its rivers, lakes and oceans) would be alkaline earth. As it is, there are only a few small patches here and there.
A curse for the makers of alkaline is a blessing for the rest of the world and joyfully welcomed by environmentalists around the planet.