According to the textbook, the gas that is thought to be responsible for most of the human- enhanced greenhouse effect, thereby adding to Global Warming, is
O nitrous oxide
methane
O carbon dioxide
O CFCs

Which barrier to economic development is shown in the following examples? i. the high rate of hiv infection in underdeveloped nations ii. the use of children as soldiers in uganda’s army in the early 2000s iii. low literacy rates in underdeveloped nations with limited exposure to adequate education a. foreign debt b. political instability c. widespread disease d. low levels of social welfare