Carbon Market Watch says the tournament will not achieve a net-zero carbon footprint, despite claims it would be the first football World Cup to do so.

Researchers believe calculations "ignore major sources of emissions".

In a statement, organisers said it was "speculative and inaccurate" to draw conclusions on their commitment...

A spokesperson for the Supreme Committee for Delivery & Legacy (SC) told BBC Sport: "We are on track to hosting a carbon-neutral World Cup.

"The methodology used to calculate the carbon-neutral commitment is best in practice and was designed to be based on actual activity data, after the World Cup has concluded. This will be published, and any discrepancies will be explained and offset...

The report's author Gilles Dufrasne says the carbon neutrality claim "is simply not credible", adding: "Despite a lack of transparency, the evidence suggests that the emissions from this World Cup will be considerably higher than expected by the organisers, and the carbon credits being purchased to offset these emissions are unlikely to have any positive impact on the climate."