Dhaka, Aug. 26 -- It's peak holiday season across Europe and North America, and people are hitting the beaches and crowding into city centres in ever-increasing numbers. They're part of a huge industry: last year, travel and tourism's share of the global economy stood at US$10.9 trillion, around 10 per cent of the world's GDP.

But residents in tourist destinations are keenly aware of the downsides: overwhelming visitor numbers, permanent changes in their neighbourhoods, antisocial behaviour, strained local services, environmental impacts including litter and pollution, and soaring housing costs.

Overtourism occurs when the industry systematically impacts on residents' quality of life. It's a growing problem, reflected in recent protests...