Final answer:
Biodiversity and traditional knowledge are sources of adaptive capacity for a more resilient response to drought in the Southwest U.S., as suggested by Gary Nabhan's readings.
Step-by-step explanation:
In the readings by Gary Nabhan, the sources of adaptive capacity that could provide a more resilient response to shocks from drought in the Southwest U.S. are exemplified by the promotion of biodiversity and traditional knowledge. This approach aligns with sustainable agricultural practices that can adapt to changing environmental conditions and supports small-scale farming systems which are critical in achieving food security and sustainable development. Emphasizing biodiversity can lead to the introduction of drought-resistant plant species and extends the range of land that can be used for agriculture, thus increasing resilience in the face of climate-related challenges.