Ions in the atmosphere

In Earth’s atmosphere, an ion is a cluster of molecules carrying an overall charge, known as a molecular cluster ion. Such cluster ions, with dimensions of approximately one nanometre, have usually been referred to as small ions, and their motion in air constitutes a small electric current. Large ions (or Langevin ions), by comparison, are physically larger (tens to hundreds of nm) and consequently electrically less mobile. Usage of the term “ion” to represent these molecular clusters originates from the early history of atmospheric electricity, which spans the discovery of the electron and the elucidation of the structure of matter. The distinction between large and small ions originates from distinguishing ions that could be accelerated by atmospheric electric fields (and therefore directly contribute to the conductivity of air), and those (the large ions) which were insufficiently electrically mobile to contribute to electrical conduction in air.

Participatory Development

Participatory development is a process of taking into account peoples’ agency in development by involving people in decision-making over planning processes that affect their lives. This permits people to achieve basic human needs but also to exercise their ability to challenge the established values and institutions that reproduce the monolithic enterprise of capitalism. Against de-territorialised and universal solutions put forward by development experts, participation raises the central issue of reflexivity, while suggesting how different forms of knowledge, power and agency relate to one another in actors’ diverse spheres of life to achieve degrees of social and environmental justice; this configures the notion of participation in processes of development.