What is scarcity and why do we all have to consider it?

Scarcity would talk about the gap between a limited supply and a theoretically limitless demand. It has to be considered since this is how people make decisions on how to allocate the said resources efficiently to satisfy the basic needs.

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!