Final answer:
Desertification is the disaster that can impact the environment in Southwest Asia.
Step-by-step explanation:
The disaster that can impact the environment in Southwest Asia is desertification. Desertification refers to the process by which fertile land becomes desert due to various factors such as climate change, deforestation, and overgrazing. Southwest Asia, also known as the Middle East, is prone to desertification due to its arid climate and unsustainable land use practices.