Costs, delays and labour shortages threaten the Osaka world expo

Japan hopes the fair in 2025 will reconnect it with the global community after Covid but calls are growing to delay or scrap the event

In the distance, beyond the clouds of sand kicked up by a coastal wind and passing lorries, the centrepiece of Osaka's plan to reconnect the world" is finally taking shape.

When completed, huge sections of timber will form an enormous walkway encircling a forest of tranquillity" and pavilions showcasing the history, culture and technology of more than 130 countries, with the host, Japan, at its heart.