7. Scientists who are concerned about increased carbon dioxide in the atmosphere believe global warming is caused by
O increasing precipitation
O human actions
O natural cycles
O changing climates

Which of the following statements best describes what is occurring in the land surrounding the sahara desert? a desertification is increasing, and the desert is expanding. b. fewer people are trying to farm in this semiarid region. c. the desert is shrinking with the increased use of irrigation. d. increased urbanization has resulted in decreased deforestation. select the best answer from the choices provided mark this and return save and exit next submit

The us and canadian governments are doing all of the following to combat environmental problems except a. encouraging the use of public transportation b. enacting clean water policies c. requiring emissions testing d. limiting animal populations in some regions

Because of their geographic similiarities, the nordic nations also have similar a. cultures c. religions b. economic activities d. all of the above