Timeline progression

[babakkhavari]

We need to create a function for how clean cooking progresses once we incorporate a timeline i.e. who gets clean cooking first?

The progression will be linear. i.e. if the start rate of clean cooking is 20% and the end rate is 80% with a time horizon of 10 years, the yearly increase will be 6%. Assume that the start year is 2020, then 26% of the population will have clean cooking in 2021. Where do the 6% who get clean cooking live?

The progression function is should give users options to progress differently. Initial suggestions:

• Based on travel time - lowest travel time (urban areas) first.
• Based on lowest cost in the cell - this would be a "low-hanging fruit" scenario. This will be dependent on the base-line as costs are relative, but also on the total number of people in the cell. It would perhaps also make sense to do per household rather than cell.
• Based on highest benefit - where will a transition give the highest positive impact? Same applies here as in the costs scenario, we can do either per cell or per household.

This function should create a new column in the gdf describing which year the investment happens. The net-benefit equation (after determining the stove to use) should also add a re-investment year column.

[babakkhavari]

When time progresses assume:

• Population in each cell is in correlation with current clean cooking access (i.e. if the clean cooking access is 60% in a cell in 2020, it never gets below or above this unless the cell is targeted)
• use get_clean_cooking_access for clean cooking access.