It claims that this would prevent the release of 500,000 tonnes of carbon dioxide each year compared with coal-fired power generation.

Hop leaves - or bracts - have compounds which prevent the release of oral toxins and stop bacteria sticking to teeth.

Disposal facilities are usually designed to permanently contain the waste and prevent the release of harmful pollutants to the environment.

This will prevent the release of about 1.7 million tonnes of carbon dioxide every year.

The standard addresses practices and procedures necessary to disable machinery and prevent the release of potentially hazardous energy while maintenance or servicing activities are performed.