�y��vlog

But Prof Clifford Jones, a specialist in combustion risk at the University of Chester, said dust released from the storage silo could have been ignited by a spark.

Nitrous oxide also has industrial uses to increase the power of internal combustion engines, and as an aerosol propellant for foods like whipped cream.

Import duty of 15% is also "much lower" than the tax on comparable combustion engine cars in India which also pay an additional road tax, according to HSBC.

Scientists have found air pollution from coal, oil and gas combustion kills millions of people around the world every year, in large part by exacerbating heart disease.

The original language of the law forbids any form of recycling that includes combustion, incineration or most kinds of energy generation.