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Tunnel is an underground or undersea passageway with common portals at ends. Used for road, rail, water, utility, and military purposes. Length often exceeds twice diameter, with various construction methods
Adaptation is adjusting to climate change effects to moderate harm or exploit opportunities. It aims to manage impacts and risks for people and nature. Adaptation can be reactive (responding to impacts) or proactive (anticipating future changes)
First proposed in 1802 by Albert Mathieu-Favier. Military concerns in 1919 and 1920s led to cancellation of initial plans. Project cancelled in 1975 due to UK-France economic uncertainty
Kathmandu is Nepal's capital and most populous city with 845,767 inhabitants (2021). Located in Kathmandu Valley at 1,324 meters above sea level. City covers 50.7 km² and is divided into 32 administrative wards
First recorded canal proposal in 1534 by Spanish ruler Charles V. Multiple attempts by France, Britain, and US before 1881. French project abandoned in 1889 due to high worker mortality