I think it’s B, I’m not for sure tho
B. an increase in the overall temperature of the Earth
I say this because the polar ice caps on the poles are melting (which is why the polar bear is now endangered.) and are a result of global warming.
The construction of dams in lower reaches involves more submergence of usually cultivated land per unit of storage due to the flat nature of the topography. Advocates of small dams stress that the cost per ha of potential irrigation of tank projects is much lower than for large irrigation projects.
The site called "Los Glaciares National Park" is the UNESCO site located in the southern hemisphere.
UNESCO mean United Nations Educational, Scientific and Cultural Organization
- The organisation aims for educational, cultural and scientific promotion of the heritage sites globally.
- UNESCO has 1,154 world Heritage Sites across 167 countries.
- In this question context, the site called "Los Glaciares National Park" is the UNESCO site located in the southern hemisphere.
Hence, the Option A is correct.
Read more about UNESCO
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