Final answer:
Brunei struggles with the need for economic diversification due to its reliance on oil and gas, while Laos faces challenges related to hydropower development and its environmental impact.
Step-by-step explanation:
One global issue in Brunei is the need for economic diversification. As a country with an economy heavily reliant on oil and gas, Brunei faces challenges in ensuring sustainable economic growth. In Laos, a significant issue is hydropower development and its impact on the environment and local communities. Both countries are also affected by broader global environmental issues such as global warming and biodiversity loss, which require international cooperation to effectively manage.