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US. President Joe Biden's landmark climate action plan may have been trailed by billions of dollars in clean energy investment, but its potential to reshape trade lines has strained ties with allies.

President Joe Biden has appealed to blue-collar workers to support his re-election quest and help him compel the richest Americans to pay more taxes.

"It's about time the super wealthy start paying their fair share," Biden told hundreds of union workers in the industrial state of Pennsylvania on June 17.

In normal years, the Sundance Film Festival kicks off in late January with Hollywood's award season already in full swing.

Producers, stars and journalists meet in the spectacular Utah mountains to swap last-minute Oscar tips, and catch a first glimpse of the next year's batch of contenders.

This year, due to the pandemic, everything has been turned upside-down.