Table 3:
Reductions in wood consumption measured or estimated in recent NBP studies
| Study | Grouping | Number of household surveys conducted (n) | Average wood consumptio n (kg/HH-day) | Standard deviation | Comments |
|---|---|---|---|---|---|
| BAMGa | Control | 24 | 2.8 | 1.2 | Results are based on weights of woodpiles participants were asked to set aside estimating their consumption on a typical day rather than wood used for actual cooking. |
| Biogas | 24 | 1.3 | 2 | ||
| Difference | −54% | ||||
| 2015 BUSb | Before biogas installation | 288 | 6.5 | NA | Estimated monthly wood use from NBP’s 2006 Baseline study (unknown sample size), converted to daily consumption. |
| After biogas installation | 15 | 1.8 | NA | Average wood use in 15 households during a 24-hour period | |
| Difference | −72% | ||||
| HIVOSc | Control | 25 | 3.6 | NA | Reflects cooking and water boiling in 25 HHs and fodder preparation in 4 HHs |
| Biogas | 5 | 0.8 | NA | Reflects cooking and water boiling in 4 HHs and fodder preparation in 5 HHs | |
| Difference | −78% |
a
From Berkeley Air Monitoring Group’s 2015 study on air quality and health impacts
b
From the 2015 Biodigester User Survey
c
From HIVOS’ 2015 study on air quality and health impacts