(lc)during the 1990s and early 2000s, u. s. leaders were concerned about the development of nuclear weapons by which country?
china
afghanistan
north korea
saudi arabia

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste