(iv) Describe and explain the effects which global warming might have on both
regional and worldwide scale.
(4
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-OTION 2

Explanation:

The effects of climate change span the physical environment, ecosystems and human societies. It also includes the economic and social changes which stem from living in a warmer world. Human-caused climate change is one of the threats to sustainability Global warming refers to the long-term rise in the average temperature of the Earth's climate system. It is a major aspect of climate change, and has been demonstrated by the instrumental temperature record which shows global warming of around 1 °C since the pre-industrial period

answer; (b); i believe its indefinite existence of human population in a healthy and prosperous condition;

a characteristic is a deep cut in the earth or left over rock aka till.