This will involve detailed work looking at:
The science team will give guidance on the pattern of rainwater harvesting that will support maximum cloud formation. Possible distant negative consequences will be assessed and quantified.
The current shortlist of likely countries is:
Rainwater harvesting has already been undertaken in Brazil, Burkina Faso, Mali, Kenya, Sudan, India and Ethiopia. UNEP have detailed rainwater harvesting suitability maps for the whole of Ethiopia, and for Africa as a whole.
Relevant governments will be consulted initially to explore their willingness to support the project. There will be participatory consultations with regional authorities and inhabitants in the areas proposed for rainwater harvesting.
Discussions with local inhabitants will need to respect their right to refuse the project or have their needs taken account of both in the project design and in its implementation.
In each continent, at least one in-country partnership will need to be created. The latter will consist of local communities, concerned NGOs, government organisations, etc
Although this is a very cheap way to have a global cooling impact over the next 20-40 years, it will still be necessary to justify implementing the project on current economic grounds. The initial stage of the project will quantify local, regional and global economic benefits.
A science/evaluation group and an overall coordinating team will be created.
Each country will need a local coordinating NGO to support rainwater harvesting activity and monitoring/evaluation. This could be existing NGOs (e.g. SEARNET) or in-country NGOs or a specially created NGO.
Creation of a Global Cooling and Drought/Flood Prevention Handbook (incorporating guidelines for improved water supply, agriculture and forestry without exacerbating malaria) for fieldworkers, NGOs, elected officials, civil servants, landowners etc. Publish and distribute.