1 What is the reason behind some people’s having dietary deficiencies?
1 They go hungry on a regular basis.
2 How has the incidence of communicable diseases fallen worldwide?
2 With the help of access to clean water and proper sanitation techniques.
3 Why are some species going extinct faster than estimated by scientists?
3 Because their habitats are being depleted by humans at an ever-increasing rate.
4 What leads to the loss of flora and fauna?
4 The damage done to ecosystems and disturbing their balance lead to the destruction of flora and fauna.
5 What are the environmentally friendly electricity production sources?
5 Wind, solar, hydroelectric and geothermal power sources are environmentally friendly.