All of earth frozen water is know as

Cryosphere

Explanation: Cryosphere is a terminology that refers to the entire frozen water on earth. It includes the ice of antarctic and arctic, ice caps, lake ice, glaciers and snows on the high mountain hills and so on.

This amount of frozen water is controlled by the amount of insolation radiation, albedo, global warming effect and the amount of carbon dioxide in the atmosphere.

High amount of incoming solar radiation and high carbon dioxide in the atmosphere will lead to the rise in the global temperature thereby melting all the ice that are present on earth.

Amount of albedo also plays a significant role as it reflects the incoming solar radiation.

Global warming has become a significant problem at present, due to the emission of toxic gases into the atmosphere such as carbon, sulfur dioxide that has the capacity to increase the temperature on earth, thereby melting the existing ice. So preventive measures must be taken.

it is very hard for the climatologists to precisely predict how will the global temperatures be changing so there's lots of models, some of which differ significantly, this is due to multiple factors, and probably the most important is the human activity.

humans have been a key factor in climate change around the globe since the start of the industrial revolution, and in the past few decades the consequences are becoming more obvious. there's lots of emission of pollutants in the atmosphere as well as changing the environment on the surface itself, so it's really hard to predict how will that go in the future because there's some countries that are reducing the damage and are going towards green energy, while others are stubbornly continuing with pollution and damages to the environment.

b. 20: 5

explanation:

20% of the worlds population lives in southwest asia, and less than 5% of the world's

land area.