Answer:
because there might be changes in the future which could make the estimates unreliable for example war or decline in economy
Explanation:
<h2><u>Answer:</u></h2>
Factors include latitude, elevation, nearby water, ocean currents, topography, vegetation, and prevailing winds. The worldwide atmosphere framework and any progressions that happen inside it likewise impact neighborhood atmosphere.
Environmental change influences the relocation of individuals inside and between nations around the globe. ... Seaside settlements and low-lying regions are especially powerless against environmental change impacts, for example, ocean level ascent, disintegration, and outrageous tempests. Rising sea temperatures and acridity may likewise compromise waterfront environments.
Economic opportunities seems to be the driving factor for migration nowadays. An example of a group of migrants migrating from areas with a lack of economic opportunities to areas with more economic opportunities are Mexican immigrants seeking job opportunities.
I know for sure the ganga and brahmaputra rivers do make up the northern plains, not sure about the yamuna. but since two do, then i would answer all of these
