Sadiq Khan backtracks on tree-planting pledge

London mayor Sadiq Khan has backtracked on his pre-election pledge to plant two million trees in the capital. The move was among a number of environmental measures Khan committed to before the mayoral election in May of this year, citing the "nearly 10,000 Londoners who died as a direct result of air pollution in 2015" in "the most polluted city in Europe".

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