This paper discusses the technology of direct capture of carbon dioxide from the atmosphere called air capture. It develops a simple arithmetic description of the magnitude of the challenge of stabilizing atmospheric concentrations of carbon dioxide as a cumulative allocation over the 21st century. This approach, consistent with and based on the work of the Intergovernmental Panel on Climate Ch...

The American anti-mosquito movement grew out of the discovery of the role of mosquitoes in transferring pathogens and public concern about pest and nuisance mosquitoes in the late 1800s. In the 20th century, organized mosquito control in the United States passed through three eras: mechanical, chemical, and integrated mosquito control. Mosquito control in the 21st century faces the challenge of...

with entrance spirituality and god to management and organization field, as 21st century challenge, organization’s managers and leaders especially educational institutions must confront with new phenomena. spiritual leader’s role to incite and encourage human resource with use of spiritual vision and establishment of cultural context based on human values, to foster empowered, high productivity...